Why don't halos display the colors of a rainbow?
A) Refraction does not occur with a halo.
B) Ice crystals are not transparent.
C) Reflection does not occur with a halo.
D) The shape and size of ice crystals are not uniform.
D
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The sun emits slightly more solar radiation during a period of high sunspot activity
Indicate whether this statement is true or false.
On this figure of a continental collision, which continent would have had subduction-related magmatism?
A) The continent on the left
B) The continent on the right
C) Both continents
D) Neither continent
Why did multinational corporations establish offices in Johannesburg, then leave, and now have returned?
A. They came for the mining, left when the mines were no longer viable, returned as service industries developed. B. They came for low-cost labor, left because of the HIV epidemic, returned when the epidemic was under control. C. They came for diamonds, left because the currency collapsed, returned when white minority rule ended. D. They came for mining, left because of apartheid, returned when apartheid ended.
Which body continually emits electromagnetic waves?
A. You and your classmates. B. The Earth. C. The Sun. D. all of the above