Why do large regions of continental crust stand high above sea level?
A) ?The rigid asthenosphere allows the thicker continental crust to stand high above oceanic crust.
B) ?Oceanic crust squeezes continental crust so that it continuously stands high above sea level.
C) ?The continent's mountains float high above sea level because the lithosphere gradually sinks into the deformable asthenosphere until it has displaced a volume of asthenosphere equal to their mass.
D) ?The uppermost mantle is thicker beneath continental crust than it is beneath oceanic crust allowing large regions of continental crust to stand high above sea level.
C
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In what year was the Environmental Protection Agency first established?
A. 1970 B. 1945 C. 1810 D. 1933
When water is evaporated out of the ocean, some of the water is lost to space.
Answer the following statement true (T) or false (F)
Polls show that more than 80% of the U.S. public strongly supports environmental laws and regulations and do not want them weakened.
Answer the following statement true (T) or false (F)
The slopes of most cinder cones are usually about 30 degrees because ________
A) they are composites of loose material and lava and the viscosity of the lava requires the slopes to form at about 30 degrees B) cinder cones are mostly basalt and basalt is too weak to maintain a slope greater than 30 degrees C) the loose materials ejected from the cone form slopes at the angle of repose D) The statement is false; most cinder cones have slopes less than 10 degrees because of the low viscosity of basalt lava flows.