Exit Which of the following is NOT a source of Earth's internal heat?

a. mantle convection

b. radioactive substances

c. gravitational contraction

d. past bombardment by asteroids

Select the materials of which atmosphere is composed

Why do you think land along coastal regions is used for manufacturing and trade more than inland areas?

Why does the layer of humus form quickly in a rainforest?

The population growth rate is a metric of how quickly a population increases in size. It is dependent upon the population's death and birth rates Human population growth rates fluctuate over time.

What problem has caused soil exhaustion and erosion in the Amazon rainforest?

Which of the following factors was key to the formation of the first civilization in the Nile Valley? A. Nomads acquired more livestock to increase their wealth. B. The region experienced a surplus of food. C.

Most U. S. beaches are shrinking or encroaching on the land rather than growing or moving seaward, so the land of the U. S. is getting smaller, not bigger.

On what continent would you find the place with a latitude of 20° n and a longitude of 0°

Which is associated with mid-ocean ridges? A. rift valleys B. volcanic structures C. extreme temperatures D. mountainous topography

What natural feature of Southeast Asia did Europeans remove to take advantage of the region's resources? plantations forests roadways rice paddies