Which process forms ridges and valleys?

What are some characteristics of a authoritarian rule in africa?

A scientist who studies the structure of the earth

What are the some factors that would affect or limit the population growth of frogs, grasshoppers, or plants?

Which of the following countries faced environmental damage during the persian gulf war? a. afghanistan b. kuwait c. saudi arabia d. yemen

A major consequence of ozone depletion is that A. certain parts of the earth will become over-vegetated. B. more harmful UV rays will reach the earth's surface. C. solar energy will become ineffective. D. acid rain will increase.

What are two factors that influence the gravitational pull of an object?

Which resources are important to the economies of many countries in Siberian Russia, Central Asia, and the Caucasus region? A. oil B. timber C. diamonds D. coal

In a short paragraph, explain the various waves of immigration to the United States. What groups were part of each of these waves?

What is a fault? A. the name for two opposing forces B. a type of crust that moves under heavier crust C. a crack in Earth's crust where movement occurs D. a volcanic region where new material is being created

How many plug-in hybrids does Obama want to see on the road in the next 6 years? 100,000 500,000 1 million 2 million