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

Environmental & Atmospheric Sciences

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a. true b. false

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A. plutonic B. composite C. cinder cone D. shield E. lava dome

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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

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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

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