Noctilucent clouds are:
A) the same as nacreous clouds, but they exist at a lower elevation.
B) found in the mesosphere.
C) most easily observed in summer.
D) most easily observed near the equator.
Answer: B
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____________________ is the condition under which all or most of the people in a population have daily access to enough nutritious food to live active and healthy lives.
Fill in the blank(s) with the appropriate word(s).
The physical geography of parts of New Mexico and West Texas, including Big Bend National Park are an extension of what?
A) The Great Plains B) The Gulf Coastal Plain C) The Rocky Mountains D) The Intermontane
________ is not a characteristic of stream flow
A) Gravitational influence B) Overland flow C) Sediment transport D) Erosion E) Traction
Following the wind dispersal of seeds, a plant becomes established in a new environment. This is an example of
a. artificial selection. b. habitat selection. c. uniform distribution. d. habitat use.