How do the holes form in vesicular igneous rocks, such as scoria and pumice? What will be an ideal response?
They result from the entrapment of gases that come out of the liquid magma when the pressure is
released.
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Consider an escalator at an angle of 45° above the horizontal that moves with a velocity of 2.0 m/s. The vertical component of its velocity is about
A) 0.7 m/s. B) 1.4 m/s. C) 1.6 m/s. D) 2.0 m/s.
Paleomagnetism confirms that at particular times in the geologic past Earth has had more than one magnetic north pole (t/f)
What will be an ideal response?
What is underemployment?
A) government (artificial) employment B) people who want to work cannot find jobs C) people are not adequately trained for advanced jobs D) people work less than they would like and that skills are underutilized E) employment that exists because worker output is not maximized, for example three people sweep a street when it would only take one
In the Southern Hemisphere, the speed of the wind-driven water ________ with depth and the water moves to the ________ of the wind.
A. decreases; left B. does not change; left C. decreases; right D. increases; right E. increases; left