1.How did Earth and other planets form? ...
2.What happened during Earth's "Dark Age," or the first 500 million years after it formed? ...
3.How did life begin? ...
4.How does Earth's interior work, and how does it affect the surface? ...
5.Why does Earth have plate tectonics and continents? ...

Compounds which are found naturally in the earth are called: a. ores b. composites c. rocks d.minerals

What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.

In the von thunen model of agricultural land use, what is produced closest to the city epicenter? a. dairy, vegetables, and fruits b. field crops, such as corn and wheat c. beef and other animal products d. wood and lumber