Approximately how many earthquakes occur worldwide each year?

During explosive volcanic eruptions, large amounts of ash entering Earth's atmosphere often trise to an altitude of 20 kilometers.

What are the differences between differing map projections ?

What kind of example is the Sunbelt? A) perceptual B) functional C) formal D) political

Who founded Spain and when did they find Spain?

Which city is closer to Greenwich, England: Los Angeles or X'ian, China (34 N, 209 East

Which of the following areas would most likely have the greatest amount of surface runoff? low, flat plain sandy beach steep mountainside V-shaped valley

Which of the following is a reason why Hartsfield-Jackson International Airport provides so many jobs to Georgians? A) It is required to hire many people because it receives tax money for its operations.

Read the article titled "Giant Jellyfish Invasion." Why are these jellyfish invading oceans near China, and how might humans have caused this problem? (Site 1)

Originally the earth probably had this type of environment a) artic b) temperate c) greenhouse

Arable land is land: a. that has been destroyed in a natural disaster b. that has experienced severe soil erosion c. that is habitable d. that will grow crops