Which of the following is true of the earth's land masses? (a) They were formed by earthquakes. (b) They are the upper part of the crust. (c) They are made of a single tectonic plate. (d) They are the densest part of the crust.

How long does it take for saturn to orbit the sun?

Impressions of tropical swamp plants were observed on rocks in polar regions. the impressions were dark black imprints, which means the fossils are examples of ( 1 ) the fossils tell us that polar regions ( 2 ) ( 1 ) a. carbonization b. mineralization c. trace fossils ( 2 ) a. had tropical plants that can grow in ice b. might have had a diffierent climate in the past c. will have abundent vegitation

What is a small water source like a stream or brook?