Many of the civil wars in Central Africa are based on __________.
a. political control
b. civil unrest
c. ethnic conflict
d. all of these
e. control over valuable resources
d. all of these
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A steep slope implies a
A) weak gradient and closely spaced contours. B) steep gradient and closely spaced contours. C) weak gradient and widely spaced contours. D) steep gradient and widely spaced contours.
________ and ________ drive water from the pores of a subducted oceanic plate, which leads to partial melting
A) Compression; tension B) Air; heat C) Heat; pressure D) Salt; oil
The caldera now filled by Crater Lake
a. ?is the center of the Mazama resurgent caldera b. ?formed as the top of the Mt. Mazama collapsed into the magma chamber after a major eruption c. was formed in a titanic eruption that destroyed Mt. Mazama and blasted pieces of it over hundreds of square kilometers. d. ?is the cooled vent formed when Mt. Mazama became an extinct volcano e. ?prevents future eruptions by providing a way to cool rising magma
Around the world, rockfalls are expected to become more common because of increased ________
A) earthquakes B) droughts C) temperatures D) tectonic mountain building E) human population