Why do scientists think Earth's core contains iron?

Which item does not contain a noble gas?neon signmp3 playerflash camerahelium balloon I need to write an email to cancel the IB test I registered for. Please help I am not good with emails An air-filled capacitor stores a potential energy of 6.00 mJ due to its charge. It is accidentally filled with water in such a way as not to discharge its plates. How much energy does it continue to store after it is filled This is correct right? lexi bought 1 2\5 pounds of green grapes and 2 3\10 pounds of red grapes. Grapes are 2.99 a pound. Did lexi spend more or less than $12 on grapes? please explain asap What is the area of the circle? Round your answer to the nearest tenth of a square inch. Helppppp this is really hard What is everything in our physical environment made of? *A matterB solidsC gases I need help on this with solutions please What are the top ten famous games in the U.S.Why? cause I wanna know :D why human are not responsible for global warming? PWEASE HELP ME Due to the known mutualistic relationships between M. smithii, Bacteroides, and the human gut, why might overweight study subjects have a different methane and hydrogen profile compared to healthy weight study subjects? Find the arc length of the semicircle. 8 Which one of these is not a step used when constructing an inscribed equilateral triangle using technology? (5 points)Create a circle using the center with given point tool.Use the compass tool to create three more circles, with the same radii as the first.Connect the point with a line through the center of the circle.Create another circle with the same radius as the original. When you restate the meaning of a passage of work, you areGroup of answer choicesCitingQuotingParaphrasingSummarizing A block of silver is weighing 8 ounces is worth $104. What is the unit rate for the Value of silver in one ounce What is the difference between refraction and reflection?In refraction, light travels from one medium to another.Refraction only happens in liquids.In reflection, light travels from one medium to another.Reflection only happens in a liquid. Can someone please help me out with this Ill mark u brainliest 1-i need to mix 25% mineral spirits to the varnish i am using what ratio of spirit to varnish am i using? 2-if i use 240 ml of varnish what quantity of mineral spirits will i need in ml ? 3-Robison's tapestries all measure 1.5m x 1m wide. Express the proportion of the tapestries' heights to width using whole numbers. Give the answer in ration. Which was the last English colony founded in North America?A. CarolinaB. New OrleansC. DetroitD. GeorgiaE. Pennsylvania