Why does a satellite in elliptical orbit gain speed as it moves closer to Earth?
A. It increases in kinetic energy.
B. It moves along the direction of Earth's gravitational force.
C. It's sum of kinetic and potential energies is a constant.
D. all of the above
Answer: B
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Between 1930 and 2011, the global human population has increased from ____ to ____.
A. 100 million; 250 million B. 500 million; 1 billion C. 1.5 billion; 3 billion D. 2 billion; 7 billion E. 7 billion; 16 billion
If all of the olivine crystallized in a typical magma and then settled to the floor of the magma chamber, would there still be enough elements present in the magma to form quartz?
What will be an ideal response?
Plate movement that results from the addition of new oceanic crust along mid-ocean ridges is known as
A) divergent upwelling. B) transverse faulting. C) seafloor magnification. D) ridge push E) slab pull.
In some areas, groundwater withdrawals are not being naturally recharged. This has led some to consider groundwater to be a ________ resource
A) variable B) nonrenewable C) renewable D) perpetual E) luxury