The density of Earth materials ________ as the core is approached.
A. decreases then increases
B. remains the same
C. decreases
D. increases
E. increases then decreases
Answer: D
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The first colonizing organisms during primary succession tend to be:
a. herbs b. lichens and mosses c. trees d. small shrubs
Which group of organisms has been most impacted by the loss of both deciduous and tropical forests?
A) migratory birds B) flying squirrels C) rabbits D) insects E) spotted owls
Which requires more work on the brakes of a freight train?
A. equal amounts of work for either. B. Slowing down from 100 km/h to 70 km/h. C. Slowing down from 70 km/h to a stop. D. need more information
A hypsometric curve shows that
A) a little more than 70 percent of the Earth's surface is covered by ocean.
B) the average ocean depth is sea level.
C) oceanic trenches occupy about 30 percent of Earth's surface.
D) the highest mountains on Earth are about a kilometer high.