Rivers downcutting into a land surface, in the absence of other forces, usually tend to erode a ________-shaped form when viewed in cross-section across its valley
A) groove
B) V
C) U
D) flat bottomed
E) delta
Answer: B
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Over a period of time, a slowly crystallizing magma liquid develops a higher silica content while magnesium abundance decreases through fractional crystallization
Do the minerals crystallizing from the magma contain more silica relative to the starting magma or do they contain more magnesium relative to the starting magma? a) The minerals contain more Si than the magma liquid b) The minerals contain more Mg than the magma liquid
In a tropical rain forest, dropped leaves, fallen trees, and dead animals decompose ____.
A. quickly due to the abundance of decomposers B. slowly due to the nutrient-poor soils C. slowly due to the abundant rainfall D. moderately and nutrients are taken up by the roots of the lianas E. quickly due to the dense ground vegetation
Important fossils and bones of several hominid species have been found in the Great Rift Valley.
a. true b. false
What type of volcanic peaks have the most gentle flows?
A. plutonic B. composite C. cinder cone D. shield E. lava dome