Totality is not completely dark during a lunar eclipse because
A) of the Sun's corona.
B) the line between umbra and penumbra is not sharp.
C) of light refracted by the Earth's atmosphere.
D) of tapering of sunlight due to the Sun's large size.
E) the Moon is not directly in the Earth's shadow.
C
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The chemical formula for gypsum is:
a. CaCO3 b. Ca,Mg(CO3)2 c. NaCl d. none of the above
Volcanic island arcs are found near which features on the seafloor?
A) Abyssal plains B) Coral atolls C) Deep-ocean trenches D) Rift zones
Cloud iridescence is most often seen within 20° of the Sun, and it is often associated with clouds such as ____
a. ?cirrocumulus and altocumulus b. ?cirrocumulus and cumulonimbus c. ?altocumulus and stratocumulus d. ?nimbostratus and cirrus e. ?cirrostratus and cumulonimbus
The "horse latitudes" are zones of minimal winds that are associated with the ________ system
A) subtropical high pressure B) trade wind C) westerly wind D) polar easterly wind E) intertropical convergence