The mT air masses that affect the United States
A) are cool.
B) are dry.
C) can bring heat waves to the Midwest.
D) are not associated with precipitation.
E) originate in the northern Atlantic.
C
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The type of water pollutant that most commonly threatens human health is/are ________.
A. Toxic and hazardous chemicals B. Thermal pollution C. Oxygen-demanding wastes D. Dissolved plant matter E. Pathogenic organisms
What traps light energy in primary producers?
a. Photosynthetic b. Thylakoid c. Chlorophyll d. Biomass
Swidden agriculture
A) has benefited significantly from logging operations. B) is most common on coastal plains. C) works best in regions of high population density. D) usually relies on monocrop production. E) depletes soil nutrients within a few years.
Frost wedging is most effective ________.
A. in the winter when the rock is frozen solid for months on end B. in the summer when abundant rainfall percolates through the cracks to freeze in contact with the very cold rock found deep below the surface C. in the spring and fall in very dry desert areas where temperatures dip down below 0°C at night and above 0°C during the day D. in areas with many days of freezing and thawing