A piece of pizza is normally a net radiator of energy when its temperature is
A. higher than its surroundings.
B. lower than its surroundings.
C. neither of these
D. not enough information
Answer: A
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The density of Earth's crust, mantle, and core increases moving toward Earth's center because
A. Early in Earth's history, it separated into layers according to density. B. Earth is plastic throughout its structure today and in the past. C. The charged particles flowing in the outer core repel the lighter elements found at Earth's surface. D. Earth's elements are distributed evenly throughout its interior.
Discuss how cleaning an oil spill can be more harmful than the oil itself. What will be an ideal response?
Deaths from infectious diseases are generally lowest in the ___ stage of the Demographic Transition
What will be an ideal response?
What type of galaxy has a mix of young and old stars, an abundant amount of gas and dust, ongoing star formation, and a definitive shapes?
A. irregular galaxies B. elliptical galaxies C. spiral galaxies D. All types of galaxies share these features.