What is a mantle plume, and what causes one to erupt? What will be an ideal response?
A mantle plume is a cylindrical plume of hot rock that rises through the mantle, most likely from the
core-mantle boundary. As the rock rises, the pressure on it declines, and the melting temperature of the
rock decreases. Melting begins and creates magma.
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Which of the following would undergo secondary succession?
a. cooled volcanic lava b. an abandoned parking lot c. a heavily polluted stream that has been cleaned up d. a bare rock outcrop e. a newly created shallow pond
Today most interregional migration in developed countries is from cities out to suburbs
Indicate whether the statement is true or false.
On land, a traveler would notice a decrease in primary productivity by traveling from the tropics to the higher latitudes
Indicate whether the statement is true or false
Which of the following are true of felsic magmas?
A. High gas pressures commonly lead to highly explosive eruptions. B. They do not allow gas bubbles to escape easily. C. They tend to have high viscosities. D. All of these choices are correct.