Which horizons make up the topsoil?
A) C horizon
B) O and A horizons
C) E, B, and C horizons
D) O, A, E, and B horizons
Answer: B
Environmental & Atmospheric Sciences
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A. Lava is above the Earth's surface, whereas magma is below. B. Magma is colder than lava. C. Lava is gassier than magma. D. Magma has a higher silicate content than lava. E. There is no difference between magma and lava.
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Barchans ____
a. are the only kind of sand dune b. are the only kind of silt dune c. are the only kind of gravel dune d. migrate
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This a pidgin language spoken in New Guinea:
A) tok pisin B) haka C) mabuiag D) pakeha E) whenua
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What triggered the debris avalanche that caused the destruction of Yungay, Peru?
A) rainfall B) an earthquake C) volcanic activity D) snowmelt
Environmental & Atmospheric Sciences