The crust makes up approximately what percentage of Earth's entire mass?
a. 1%
b. 10%
c. 25%
d. 50%
a
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In the system of stream orders, the smallest unit in the network is at the ______.
a - 4th order b - a variable number c - 2nd order d - 1st order e - 3rd order
After a rock that is thrown straight up reaches the top of its path and is starting to fall back down, its acceleration is (neglect air resistance)
A) greater than when it was at the top of its path. B) less than when it was at the top of its path. C) the same as it was at the top of its path.
Which of the following is the correct order of lake succession, from lowest to highest nutrient levels?
A) oligotrophic, mesotrophic, eutrophic B) eutrophic, oligotrophic, mesotrophic C) mesotrophic, eutrophic, oligotrophic D) oligotrophic, eutrophic, mesotrophic
An instrument used to measure air pressure is
A) an aneroid barometer. B) a mercury thermometer. C) an anemometer. D) a wind vane.