Which of the following is the greatest current threat to forests in the United States?
A) Earthquakes
B) Erosion
C) Fires
D) Logging
C
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The geologic relationships in this figure indicate that
A) the lava flow pushed the trees over.
B) the lava flow overlies an angular unconformity.
C) the lava flow is younger than the landscape surface partially covered by the lava flow.
D) materials beneath the lava flow were uplifted from great depth.
As cP air moves south from Canada to near the Gulf of Mexico, the largest drop in temperature will occur at
A) the U.S.-Canadian border. B) Minneapolis. C) Saint Louis. D) Birmingham.
Tropical rain forest climates are influenced by subtropical high pressure cells year-round
Indicate whether the statement is true or false
In reverse the osmosis of sea water to produce drinking water approximately what is the typical residual concentration of salt in the drinking water which is produced?
A) 0 B) 40 ppm C) 400 ppm D) 4000 ppm