The boundary between two air masses is called a(n)
A) dividing line.
B) squall line.
C) instability line.
D) front.
Answer: D
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When a message molecule binds to a receptor,
A. the cell begins to grow and divide. B. the target cell passes the message molecule to another target cell. C. a series of chemical reactions begins. D. the message molecule enters the target cell.
Soils with shale-derived parent material usually differ from those from sandstone-derived parent material in that they tend to
A) be more drought-prone than the sandstone-derived soils. B) break down organic matter slower than sandstone-derived soils. C) resist weathering more than sandstone-derived soils. D) form clays with more soluble cations than the sandstone-derived soils.
Crystal size can be used to help distinguish
A) clastic from chemical sedimentary rocks. B) hydrothermal from chemical rocks. C) volcanic from plutonic igneous rocks. D) regional from contact metamorphic rocks.
Which statement about India's resource and environmental problems is false?
A. India has 18% of world's people, but only 2.3 % of world's land resources. B. About one-half of India's cropland is degraded. C. About two-thirds of its water is seriously polluted. D. India has about 15% of the world's forests. E. Sanitation services are often inadequate.