The high temperatures in the thermosphere occur because
A) high intensity solar radiation causes strong chemical reactions with ozone, and this heats the layer to very high temperatures.
B) carbon dioxide has accumulated to very high levels in this layer.
C) infrared radiation from the ground heats this layer more than any other layer.
D) it is in direct contact with high energy solar radiation.
E) methane is such an effective greenhouse gas.
D
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Which of the following represents the largest waste disposal practice in the United States?
A. landfills B. incineration C. composting D. recycling
Which of the following is NOT a controlling factor for soil formation?
a) Time b) Climate c) Slope d) Heat from a magma chamber e) Organic activity
The spinning of a shrinking nebula marks the transition from a protostar to a star
Indicate whether the statement is true or false
Which of the following is an example of nonpoint-source pollution?
A) Sewage from a municipal sewage treatment plant B) Trash dumped from a ship C) Fertilizer-enriched runoff from agricultural fields D) Wastes from an industrial facility