When a river reaches a base level, its forward velocity rapidly decelerates as it enters a larger body of standing water and ________ is formed
A) an estuary
B) an alluvial terrace
C) a delta
D) a stream terrace
C
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Endemic species are
A) well-established and show the least risk of extinction. B) limited to just one location, such as an island. C) widely distributed, found especially on large continents. D) usually the dominant species within an ecosystem.
Aside from limestone, which other kinds of environments produce karst terrain?
A) Evaporite rocks such as gypsum B) Areas underlain by salt C) Sandstone D) Evaporite rocks and areas underlain by salt, but not sandstone
Phytoplankton use which of the following to control their buoyancy?
A. Feathery appendages B. Oil C. Spikes D. None of these E. All of these
Where in a hurricane is the atmospheric pressure lowest, and approximately what is that pressure?
a. lowest in the zone of high winds, just outside the eye; about 950 millibars b. lowest just outside the eye wall; about 920 millibars c. lowest in the eye; about 960-970 millibars d. lowest in the eye; about 1200-1300 millibars e. lowest in the zone of high winds, midway between the eye and its outer fringes; about 900-910 millibars