What is the breaking of rocks due to constant expansion and contraction called? A. mechanical weathering

B. chemical weathering

C. deposition

D. leaching

Which statement about traditional economies is not true? A. Those who produce goods also consume them. B. They are most common in rural parts of less developed nations. C. They generally produce few surplus goods. D.

Which of the following is not an advantage to tracking changes in the climate system? a. forecasting weather b. predicting natural disasters c. tracking human impact on climate d. preventing weather events

How much of the protein consumed by humans around the world is fish? 5 percent 20 percent 40 percent 50 percent

Which of the following is an example of evaporative cooling? Select one: a. standing in a breeze after getting out a pool in summer b. droplets of water condensing on the side of a cold drink on a hot and humid day c.

Why are some of the geological time periods not represented in the strata forming the Grand Canyon? A.) The age of some of the Grand Canyon's layers is unknown. B.) Unconformities resulted in the erosion of some representative layers. C.

According to the International Astronomical Union, which of the following is one of the criteria for an object to classified as a Planet? Select all that apply.

What physical features are the five largest cities in the u. S. Near?

Because of his failed economic plan, Mao Zedong later opened China up to foreign trade. True False

Your friend tells you that our orbit is so special that it is at just the right distance from the sun for us to be at the right temperature for life to flourish. He says that if we were even ten miles closer to the sun, we would burn up.

The suns energy is classified by what