Only 5% of the Earth's land is strictly protected from human activities. With this level of protection, which of the following statements is the reason that so many land species are increasingly threatened with extinction?
A. Because conservation biologists say we need to strictly protect 20%.
B. Because so much land is being lost to flooding from rising sea levels.
C. Because of reduced sunlight from atmospheric pollution.
D. Because of a dramatic increase in earthquakes and volcanoes.
Answer: A
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At the edge of a cliff you throw one ball downward and another ball upward at the same speed. With negligible air resistance, which ball hits the ground faster?
A. The ball thrown upward. B. The ball thrown downward. C. Both hit with the same speed but not at the same time. D. none of the above
Introduction of the gray wolf to Yellowstone National Park caused the squirrel population to increase
Indicate whether the statement is true or false
What are the most common kinds of landslides?
a. block glides b. creeps c. debris flows d. lahars e. slumps
How would you recognize and distinguish between landscapes affected by wind erosion and deposition?
What will be an ideal response?