Deep Triassic fault basins that closely parallel the eastern margin of North America indicate a breakup of Pangea and that a western extension of rifting of the North American continent from Africa took place during the Early Triassic. The extension or accretion of a complex array of exotic terranes to the western margin of North America from northern Washington State to southern Alaska began during the Late Jurassic.
The Early Triassic collision of the Golcanda volcanic arc and a microcontinent to the western margin of North America, best describes the Antler orogeny.Let us discuss each option in detail:A. That shallow seas must have covered most of the North American craton during the Early Triassic is incorrect. The fact is that the Deep Triassic fault basins that closely parallel the eastern margin of North America indicate a breakup of Pangea and that a western extension of rifting of the North American continent from Africa took place during the Early Triassic.
Therefore, option B is correct.C. That continental suturing along the eastern margin of the North American craton must have taken place during the Early Triassic is incorrect. Therefore, option C is incorrect.D. Nothing about the rifting of Pangea, but rather that a significant amount of erosion was occurring along the eastern margin of North America during the Early Triassic is incorrect. Therefore, option D is incorrect.The addition or accretion of a complex array of exotic terranes to the western margin of North America from northern Washington State to southern Alaska began during the Late Jurassic.
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11. The joints expressed by dip and direction. True False 12. Hexagonal or columnar jointing is due to compression stress. True False 13. Differential stress means a change in shape, but not in size. True False 14. Closed fold has a constant thickness of beds. True False 15. Oceanic crust destroyed at convergent boundary. True False
11. The statement 'The joints expressed by dip and direction' is true.
12. The statement 'Hexagonal or columnar jointing is due to compression stress' is false.
13. The statement 'Differential stress means a change in shape, but not in size' is false.
14. The statement 'Closed fold has a constant thickness of beds' is true.
15. The statement 'Oceanic crust destroyed at convergent boundary' is true.
11. The joints expressed by dip and direction - True
The joints expressed by dip and direction are said to be having two intersecting planes which measure the angle of slope and direction of each plane. Thus, it can be expressed that the above-given statement is True.
12. Hexagonal or columnar jointing is due to compression stress - False
Hexagonal or columnar jointing is due to cooling of the lava which forms prismatic columns. This is the outcome of the contraction that happens when the lava cools down. Therefore, it can be expressed that the given statement is False.
13. Differential stress means a change in shape, but not in size - False
Differential stress is defined as the stress which results in the difference of pressure in different directions. It leads to changes in the size and shape of a particular object under stress. Hence, the given statement is False.
14. Closed fold has a constant thickness of beds - True
A closed fold refers to the fold that has a U-shape and has a constant thickness of beds. Hence, it can be expressed that the given statement is True.
15. Oceanic crust destroyed at convergent boundary - True
Oceanic crust is denser than the continental crust and hence when two plates carrying oceanic and continental crusts collide, the oceanic plate is forced to subduct under the continental plate. Therefore, it can be expressed that the given statement is True.
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11. True
The joints expressed by dip and direction is a true statement. Joints are formed due to the internal forces of a rock. These forces include tectonic pressure, cooling and contraction, and stress caused by erosion. Dip refers to the angle of the fracture in relation to the horizontal plane,
while the direction indicates the direction of the fracture.
12. True
The statement "Hexagonal or columnar jointing is due to compression stress" is false. This is because hexagonal or columnar jointing is due to the contraction of lava flows or cooling and contraction of igneous rocks. This is why they are often found in igneous rocks such as basalt.
13. False
The statement "Differential stress means a change in shape, but not in size" is false. Differential stress refers to the unequal distribution of stress in a material. It results in a change in the shape and size of the material.
14. False
The statement "Closed fold has a constant thickness of beds" is false. A closed fold has a varying thickness of beds. This is because the layers of rocks are bent into a U shape, with the outermost layers curving upwards and the innermost layers curving downwards.
15. True
The statement "Oceanic crust destroyed at convergent boundary" is true. Oceanic crust is denser and thinner compared to continental crust. When it collides with continental crust at a convergent boundary, it is forced downwards into the mantle where it is destroyed. This process is known as subduction.
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what geographic feature had the largest impact on egyptian culture and prosperity?
The geographic feature that had the largest impact on Egyptian culture and prosperity was the Nile River. Egypt is known as the "Gift of the Nile" because it is a desert region that has received little to no rain in the past.
The Nile River was essential for the development of Egyptian civilization because it provided the water and fertile soil that was necessary for agriculture, which was the basis of the economy.Agriculture in Ancient Egypt was dependent on the annual flooding of the Nile, which deposited silt and nutrients on the land. The river was also important for transportation and communication, as it was the main route of trade and commerce in the region.
It allowed Egyptians to transport goods and people easily from one place to another.The Nile River also played an important role in the religion and culture of the ancient Egyptians. They believed that the Nile was a sacred gift from the gods and that it had a divine origin. The Nile was also associated with the cycle of life and death, and many Egyptian myths and legends were based on it. In conclusion, the Nile River was the geographic feature that had the largest impact on Egyptian culture and prosperity.
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