Iridium, a hard, whitish metal similar to platinum, is extremely rare on Earth. Extremely high concentrations of iridium on Earth result
from only two scenarios: massive volcanic eruptions that release iridium from deep within the Earth and meteorites that shower down on Earth from space. When scientists found concentrations of iridium 30 times higher than normal in rock stratum from 65 million years
ago, they concluded that a massive meteor or comet hit the Earth and caused the massive extinction of the dinosaurs.
Which of the following, if true, most strongly supports the scientist’s conclusion?
A. Volcanoes massive enough to generate high concentrations of iridium are very rare.
B. Massive volcanic eruptions occurred frequently 80 million years ago.
C. Most scientists support the hypothesis that a cosmic impact wiped out the dinosaurs.
D. The massive extinction that occurred 70 million years ago killed not only the dinosaurs but also 70 percent of all life on Earth.
E. A comet struck the earth some 120 million years ago, but no widespread extinction occurred.

Answers

Answer 1

Answer:

B. massive volcano eruptions occurred frequently 80 million years ago

Answer 2

Massive volcanic eruptions occurred frequently 80 million years ago is most strongly supports the scientist’s conclusion. Therefore, option B is correct.

If massive volcanic eruptions occurred frequently 80 million years ago, it suggests that the high concentrations of iridium found in the rock stratum from 65 million years ago could be attributed to these volcanic eruptions rather than a cosmic impact.

This would weaken the argument that a meteor or comet caused the extinction of the dinosaurs, as an alternative explanation for the elevated iridium levels is provided.

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Related Questions

What moderates much of the air temperature over northwestern Europe?

Answers

Answer:The North Atlantic Drift Current moderates much of the air temperature over northwestern Europe, especially the British Isles.

Explanation:

Solve for x: 2 ( x+5 ) = 0

Answers

Answer:

x=-5

Explanation:

Answer:

x = -5

Explanation:

Distribute 2 to the parentheses:

2(x + 5) = 0

2x + 10 = 0

Subtract 10 from both sides:

2x = -10

x = -5


Which piece of evidence explains WHY the 5 themes of geography were created?

A.In 1984, educators sought to better organize the teaching of geography in kindergarten through 12th grade classrooms.

B.The themes were created by the National Council for Geographic Education & the
Association of American Geographers.

C.While these five themes have been since replaced by the National Geography
Standards, they still provide an effective organization for the teaching of geography.

D.Humans shape the landscape through their interaction with the land; this has both positive & negative effects on the environment.

Answers

Answer:

g

Explanation:

How can you combat the danger of a single story?

How can teachers?

How can politicians?

Answers

Answer:

We should read it again and again.

And try understand what the author is willing to explain...

Teachers:

Teacher's used to read the every lessons at their free time.So that they can understand the concept very easily..

PLEASE HURRY

analyze the map below and answer the questions that follow

on the map above what landform is located at oval C
the sahel
the Sahara Desert
the Nile River Valley
the Atlas Mountains

please select the best answer from the choices provided​

Answers

Answer: The Nile River Valley

Explanation:

Answer:

C. THE NILE RIVER VALLEY

Explanation:

WHY, BECAUSE IF YOU WERE TO LOOK CLOSE ENOUGH YOU WILL SEE THE RIVER AND THE VALLEY

ANOTHER REASON IS JUST THAT I KNOW

hOPE tHIS hElPS

pERIOD poOH

Who is known as missile man of india give answer by not searching on google

Answers

Answer:

Explanation:

It's apk Abdul kalam

Answer:

He is A.P.J. ABDUL KALAM.

Explanation:

He was an Indian aerospace scientist and politician who served as the 11th PRESIDENT of india from 2002-2007.

He was born and raised in Rameswaram.

He studied physics and engineering.

What problems do mapmakers face when making maps?

Answers

Answer:

distortion

Explanation:

The earth isnt flat

Answer:

The map makers face the following problems when they are doing maps:

1. problems with the cartographic projection

2. representation of 3D objects in 2D.

3. capacity to represent on a map the geographic aspects.

4. ability to synthesize information

5. the use of appropriate conventional signs

Biggest lake In the world?

Answers

Answer:

Caspian Sea

Explanation:

The Caspian Sea in Asia is the largest lake in the world, with an area of 143,000 sq miles.

Hope this helped!

Caspian Sea

Biggest lake In the world is the Caspian Sea

HELP ME HELP ME HELP ME !!!!!!!!!!!!!!! https://brainly.com/question/17190497

Answers

WHATS THE QUESTION???

Answer:what is the question

Explanation:

Compare and contrast spatial variation and spatial association

Answers

Answer:

The difference now is that the object involves some kind of computation. And there is a strong emphasis on physicality, form, and tactile ...

Porosity increases:_________. a. when grains settle more closely together after deposition.b. with increasing crystallization between grains in sedimentary rock. c. with the cementing of sediments by minerals from groundwater. d. when rocks develop joints or fractures.

Answers

Answer:

The correct solution is Option d (when rocks develop joints or fractures ).

Explanation:

Porosity is observable from descriptive samples taken. The drawbacks of receivable dams are that this is impossible to make true reflection temperature measurements, specific side-wall concrete samples while being often valuable can also result in poor coverage as well as dependence on log-derived porosity seems to have become the standard.As porosity rises, too much wind needs to pass further through most of the shelterbelt, which would be to say the less significant decrease in wind direction.

Some other available scenarios have no connexons with the particular circumstance. So this seems to be a reasonable option.

Which major economic activity in the Middle East occurs largely in the areas circled on the map above?

A) coal mining
B) farming
C) nomadic herding
D) oil production

Answers

Answer:

Which major economic activity in the Middle East occurs largely in the areas circled on the map above?

D) oil production

Answer:

D.) oil production

Explanation:

Got it right on edge 2020 :)

A wooden block 72cm long,42cm wide and 36cm high,is to be cut into cubical blocks of side 7cm.What is the maximum number of cubical blocks obtained?

Answers

Answer:

  300

Explanation:

The larger block can be cut into 7 cm pieces for a total of 10 pieces along the 72 cm dimension, 6 pieces along the 42 cm dimension, and 5 pieces along the 36 cm dimension. That will yield a total of

  10 × 6 × 5 = 300 . . . cubical blocks

__

Remaining scraps could be fastened together to make additional blocks.

Answer:

300

is the maximum number of cubical blocks that obtained.

Solve for x: 2 ( x+5 ) = 0

Answers

Answer:

x = -5

Explanation:

2 ( x+5 ) = 0

2x + 10 = 0

2x = - 10

x = -10/5

x = -5

Answer:

i think x=5

Explanation:

Which of the following statements is false? Group of answer choices South America's population remains concentrated in its interior, although many peripheral locations are growing rapidly. Strong cultural pluralism exists in a majority of the countries in South America. In general, the southern portion of South America is the most developed and the northeastern portion is least developed. Brazil alone accounts for over half the land area of South America.

Answers

Answer:

South America's population remains concentrated in its interior, although many peripheral locations are growing rapidly.

Explanation:

The continent of South America occupies a total area of 6.89 million square miles and has a populace of over 400 million. In South America, the estimated population is Fifty Six people per square mile. The three most populated countries in South America that are Venezuela, Ecuador, and Columbia all lie on the peripheral region of the continent. Therefore the statement that South America's population remains concentrated in its interior is false.

Which of the following is NOT native to Australia?

Answers

Answer: A, C and D

Explanation:

The correct answer is (D), sheep. Didgeridoos and boomerangs are artifacts invented by  Australian Aborigines . Koalas evolved in Australia, and to this day are only found in the wild in Australia. In contrast, sheep were first domesticated in ancient Mesopotamia and then brought by humans to other parts of the world. The first sheep were brought to Australia by ship, from the Cape of Good Hope in 1788.

Answer:sheep Explanation:

Why is millet grown in the Sahel? A. It tastes better than wheat or barley. B. It is cheaper to grow than wheat or barley. C. It requires less water to grow than other grains. D. It has a longer cultivation cycle than other grains.

Answers

I would say C. It makes sense

Answer:

D. It has a longer cultivation cycle than other grains.

Explanation:

Write a description of what happens to the water when it rains in your neighborhood. In your writing you should answer the following questions: Where does the rainwater go once it hits the ground? Where do you see that the rain is absorbed? Where does runoff occur? Where do you think most of the water ends up?

Answers

Answer:

The question can be best explained in the light of the world hydrological cycle.

Explanation:

This is a process of the hydrological cycle were the waterfalls in the form of rains and later on gets absorbed or evaporates from the ground or natural vegetation. This falling water may also get collected as lakes and other water bodies. When it rains in the neighbour the water the falls on the ground is in filtered through the pore of the soil and percolates deep down to form aquifers and groundwater table. This water body acts as a reservoir and in the end, meets with the water of the ocean and sea through the subsurface flow.

the fastest growing major religion in the world is ​

Answers

Islam is growing faster than any other religion.

In fact, some demographers believe that around

the year 2070, muslims will outnumber christians.

Christian populations are still growing, but not

nearly as fast to keep up with the pace of muslims.

A thrust fault increases the thickness of the crust as it moves toward a continental interior in a mountain belt; yet the crust beyond the mountain front stays the same thickness. Isostasy would suggest that the area at the mountain front, where the thrust emerges, should ________ over time.

Answers

Answer:

subside

Explanation:

Isostasy is a geographical term which describes the condition of gravitational equilibrium that exists within the Earth's crust and mantle, there by, making the crust stays above a heights that relies on its physical attributes, such as thickness and density.

In Isostasy, its occurrence process involves principles of buoyancy in which an Earth crust apply stress on the less stronger mantle, such that for over a geological time moves laterally in a way that the load is contained by height adjustments.

Hence, Isostasy would suggest that the area at the mountain front, where the thrust emerges, should SUBSIDE over time.

QUICK DUE IN A FEW MINUTES!!!what’s my responsibility as a citizen to the earth

Answers

Answer:

growth

Explanation:

ur living the life as once ur was a child than a kid to a teen and final to adults there many purpose as ur responsivlity

Which statements accurately describe soil? Check all that apply.

1)Soil condition directly affects crop growth.

2)Soil is used faster than it is replaced.

3)Soil cannot be replaced in a short time.

4)The amount of soil on Earth is unlimited.

5)The destruction of soil can take just minutes.


Answer is 1,2,3,5

Answers

Answer:

1, 2, 3, and 5 are the correct answers.

The correct statements are that-

Soil condition directly affects the crop growth.Soil is used faster than it is replaced.The soil cannot be replaced in a short time.The destruction of soil can take just minutes.

The correct set of options that match the statements above are as under 1, 2, 3 and 5.

Soil

If the soil is infertile, there will be poor or no growth of crops. If the soil condition is healthy, the crop growth will be good.

The soil replacement takes place gradually over a period of time due to natural events like wind, rain, etc.

The amount of soil on Earth is limited at a given point of time. Due to deforestation, the amount of soil is also getting reduced.

Destruction of soil can happen due to natural calamities like landslides, earthquakes, etc.

Hence, the statements as under 1, 2, 3 and 5 are correct about the characteristics of soil.

Learn more about soil here:

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Lines b and c are parallel. Horizontal and parallel lines b and c are cut by transversal a. Where line b intersects line a, 4 angles are created. Labeled clockwise, from uppercase left, the angles are: (13 x + 9) degrees, 2, 4, 3. Where line c intersects line a, 4 angles are created. Labeled clockwise, from uppercase left, the angles are: 5, 6, (5 x + 9) degrees, 8. What is the measure of Angle6?

Answers

Answer:

  54°

Explanation:

We believe the intended angle numbering is as shown below. This means the marked angles are supplementary, so ...

  (13x +9) +(5x +9) = 180

  18x +18 = 180

  x + 1 = 10

  x = 9

Angle 6 is congruent to (5x+9), so has measure ...

  (5(9) +9) = 54 . . . . degrees

Angle 6 is 54 degrees.

Rough seas with dangerous icebergs describe which of the following locations?
A.
Río de la Plata
B.
Drake Passage
C.
Amazon River
D.
Angel Falls

Answers

Rough Seas With Dangerous Icebergs Describe Which Of The Following Locations? Drake Passage

Answer:

Drake Passage

I hope this helps

Qué semejanzas y diferencias reconoces entre las civilizaciones americanas (Mayas, Aztecas e Incas) y el pueblo Mapuche, previo a la conquista de los europeos? *

Answers

This is English Brainly, You can ask questions in Spanish Brainly

Es Brainly en Ingles, Puedes pedir preguntas en Brainly en Espanol.

What are the most appropriate metric units to use to measure? 1. The distance to the door. 2. The amount of water in a glass. 3. The weight of the homemade chocolate chip cookie you wish you had. 4. The distance between you and the nearest stop light.

Answers

Answer:

1 and 4

Explanation:

because they are measures of nearness or farness(distance)

2. is a measure of volme while 3. is a measure of weight

why do you think our people in the past not trade in a large scale?​

Answers

Answer:

The Industrial Revolution, for example, brought large-scale changes to our socio-economic structures and the kinds of work people

Given that point A is the midpoint of line segment ED, where E( -1,9) and A(4,5), what is the location of point D?

Answers

Answer:

D(9, 1)

Explanation:

Since A is the midpoint of ED, then;

A = ([tex]\frac{X_{1}+X_{2} }{2}[/tex], [tex]\frac{Y_{1}+Y_{2} }{2}[/tex])

A(4, 5) ⇒ 4 =  [tex]\frac{X_{1}+X_{2} }{2}[/tex] and 5 = [tex]\frac{Y_{1}+Y_{2} }{2}[/tex]

[tex]\frac{X_{1}+X_{2} }{2}[/tex] = 4

[tex]X_{1}[/tex] + [tex]X_{2}[/tex] = 8

But [tex]X_{1}[/tex] = -1, then;

-1 + [tex]X_{2}[/tex] = 8

[tex]X_{2}[/tex] = 9

[tex]\frac{Y_{1}+Y_{2} }{2}[/tex] = 5

[tex]Y_{1}[/tex] + [tex]Y_{2}[/tex] = 10

But [tex]Y_{1}[/tex] = 9, then;

9 + [tex]Y_{2}[/tex]  = 10

[tex]Y_{2}[/tex]  = 1

Therefore, point D has coordinates (9, 1).

Which of the following are characteristics of the Coriolis effect? Choose one or more: It has a maximum effect at the equator. It is caused by the Earth's rotation. It deflects surface water to the right in the northern hemisphere. It deflects surface water to the left in the northern hemisphere. It influences the surface ocean currents.

Answers

Answer:

Which of the following are characteristics of the Coriolis effect?

Choose one or more:

It is caused by the Earth's rotation.

It deflects surface water to the right in the northern hemisphere.

It influences the surface ocean currents.

The following are characteristics of the Coriolis effect:

B. It is caused by the Earth's rotation. C. It deflects surface water to the right in the northern hemisphere. E. It influences the surface ocean currents.

Coriolis effect is the way things move in some sort of deflection or curve when they travel over a long distance.

This phenomenon makes different aspects of the earth to move at certain velocities and is caused by the rotation of the earth.

This shift happens in the northern and southern hemispheres of the earth and it deflects the surface water.

Therefore, the correct answers are options B, C and E

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What season is it in St. Petersburg, Russia on March 30th?

Answers

Answer: spring!

Explanation:

there is no real explanation :)

'Season' is described as the 'divisions of time across the year according to the changes experienced across various environmental factors.'

- The season that resides in St. Petersburg towards March-end would be the 'Spring Season.'

The season depends on various factors:

Change in the ecology of the location. Variation in the climate of the place. The alterations in the atmospheric situations throughout the year. The hours for which the place receives daylight.

As per the meteorological reports, the season in St. Petersburg during March is the Spring season.

The temperature ranges between 24.4°F and 35.6°F with a mean of 4hours of sunlight per day.. It is the very beginning month of the spring season and therefore, cold is experienced by the inhabitants during this time. A slight rainfall is also expected that allows the flora of the place to grow and bloom.  

Learn more about 'season' here:

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