This is a diagram of a sinkhole. What most likely cause this to occur?

A student hypothesizes that a sample of rock is formed form ocean sediments. Which would best help the student support this hypothesis?

Students are going to test minerals on a field trip. Which would they need to have to perform the streak test?

A scientist is studying energy transfer that occurs in the atmosphere, the mantle and the oceans. What is he most likely studying?

the layer of the atmosphere that is closest to the surface of the Earth is the.....