What happened to the Cuyahoga River that increased awareness of environmental problems?
a. It smelled bad.
b. People drowned in it.
c. It was drained.
d. It caught on fire.
Answer: D
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During the Silurian, the collision of Gondwana and Laurentia produced the large landmass of
Laurasia. Indicate whether the statement is true or false.
Polar bears ________.
A. can swim continuously for 100 km, feed primarily on fish, and are found at both poles B. can swim continuously for 100 km C. do not like to get wet D. feed primarily on fish E. are found at both poles
In the chemical weathering–CO2 feedback, as chemical weathering increases, ____
a. the amount of CO2 in the atmosphere stabilizes b. the amount of CO2 in the atmosphere decreases c. the amount of CO2 in the atmosphere increases d. Earth’s climate begins to warm e. more water vapor evaporates from the oceans
The most frequent time of day for hail based on a sample of five U.S. cities is
A) 6 a.m. B) noon. C) 4 p.m. D) 10 p.m.