The basic soil sampling unit is
A) soil horizon. B) soil profile. C) polypedon. D) pedon.
D
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In which depositional environment would breccia form?
1) Glacial deposits 2) Sand dunes 3) Alluvial fan 4) Deep marine 5) Playa lakes
Which scientist led Darwin to his great idea about the cause of evolutionary change by observing that human populations grow much faster than available food supplies and that famine was an inevitable feature of human existence?
A) Charles Darwin B) Charles Lyell C) Thomas Malthus D) Jean Baptiste Lamarck
What do Yellowstone, Crater Lake, and Long Valley, California, have in common volcanically?
A. They are composite volcanoes. B. They have had caldera eruptions. C. They are basaltic in nature. D. They are on the circum-Pacific belt. E. They have no history of volcanic activity.
Excess surface water percolates through the zone of ________ to reach the water table and the zone of ________
A) aeration; saturation B) hydration; infiltration C) porosity; permeability D) dehydration; hydration E) infiltration; porosity