The bottoms of clouds are often gray because
A) precipitation is imminent.
B) they are over dark portions of the Earth's surface.
C) the bottoms of clouds are denser than the tops, and thus absorb more light.
D) multiple scattering has removed most light before it reaches the bottom of the cloud.
E) droplets or crystals within the cloud have dispersed most of the available light.
D
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The best evidence that the Sun is a newcomer in the universe is
A. the existence of heavy elements in its composition. B. its relatively slow rate of spin. C. its position in the galaxy. D. its very existence in spite of its high burning rate. E. its high temperature as revealed by its color.
The explosive eruption of Mount St. Helens in 1980 generated a large amount of pyroclastic
material. Indicate whether the statement is true or false.
When snow thaws and refreezes, which results in a loss of air and pore spaces, the result is
____________________. Fill in the blank(s) with the appropriate word(s).
Plastic ________.
A. from beverage containers is easily recyclable if decapped, washed, and squashed B. polystyrene is considered a plastic contaminant C. not made from recyclables is made from renewable raw materials D. from grocery bags is labeled with recycling symbols #1 and #2 E. containers from motor oil are recycled with beverage bottles to make new bottles