Small, explosive basalt volcanoes formed at continental rifts and the flanks of shield volcanoes are ____
a. ?resurgent caldera
b. ?lava domes
c. ?cinder cones
d. ?stratovolcanoes
e. shield volcanoes?
ANSWER: c
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Approximately what percentage of amphibian species is threatened with extinction and declining worldwide?
a. 43% b. 33% c. 33%, 43% d. 80% e. 43%, 53%
Why is carbonic acid the most abundant acid in chemical weathering?
A) Carbon dioxide is present in the atmosphere and in soil; it combines with water vapor in the atmosphere and water percolating through soil to produce weak carbonic acid. B) Carbon dioxide easily breaks down to carbonic acid. C) Carbonic acid is so good at chemical weathering that it appears all the time. D) Acetic acid is rare, so carbonic acid is common.
If deforestation and fossil fuel burning continue to increase at their current rates, greenhouse gasses in the atmosphere are predicted to ________ by 2050
A) increase 20% B) double C) decrease by 50% D) increase 30% E) triple
Creating a new wetland where one has been destroyed is referred to as
A. wetland rehabilitation B. bioremediation C. wetland reclamation D. wetland mitigation E. wetland restoration