Giant stars
A) are close to exhausting their supply of hydrogen.
B) have already exhausted their supply of hydrogen.
C) are close to exhausting their supply of helium.
D) have already exhausted their supply of helium.
A
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A typical cloud-to-ground lightning event consists of
A) a single electrical discharge. B) a massive release of latent heat. C) a combination of ionospheric discharge and wind shear. D) several distinct steps that look to the human eye like a single lightning strike.
By 2025, demographers predict that what percentage of the world will be living in urban areas?
A) about 60% B) approximately 30% C) at least 50% D) a little less than 70% E) almost 90%
Which of the following sediment sizes is likely to be transported mostly on the bottom of the stream bed?
A. sticky clay particles B. fine sand C. pebbles and cobbles D. dissolved materials
This type of crater, which is very abundant on most moons and solid planets, is formed by
A. an explosive volcanic eruption. B. impact from a meteoroid or other object from space. C. a nonexplosive volcanic eruption. D. the collapse of a limestone cave.