Contrast the amount of sunlight received by an area near the equator and a same-
sized area near the South Pole.

Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite

The physical processes that create most of earth's physical features, including mountains, are known as

5. what is a red giant? can our sun become a red giant? why or why not?