Earth's crustal rocks have a higher density compared to the Earth as a whole.
Answer the following statement true (T) or false (F)
False
Due to mantle convection and plate tectonics, lower-density elements have accumulated in Earth's crust over time. Thus, crustal rocks are of lower density compared to the Earth as a whole.
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Hang from a pair of gym rings and the upward support forces of the rings will always
A) each be half your weight. B) each be equal to your weight. C) add up to equal your weight.
Which of the following would not be considered matter?
A) light B) trees C) air D) clouds E) rain
Which are closer together: the two nuclei within potassium fluoride, KF, or the two nuclei within molecular fluorine, F2?
A) KF B) C) Both are the same. Any atom bonded to F will have the same inter-nuclear separation. D) It makes little sense to compare two molecules which exist in different physical states. KF is a solid while F2 is a gas.
The beginning of the Phanerozoic is marked by the ________
A) abundant life forms compared to earlier times B) formation of large land masses C) evolution of land plants and animals D) development of hard body parts, such as shells and bones E) existence of a modern atmosphere