The law of energy and mass conservation states that ________
A) both energy and matter can be created and destroyed
B) energy and matter cannot be created or destroyed
C) energy can be created and matter destroyed
D) energy cannot be destroyed but matter can be created
B
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A good rule: Action and reaction pairs of forces always act on
A. different bodies. B. the same body. C. either of these D. none of the above
Which of the following statements describes the relation between low clouds at night and the atmospheric greenhouse effect?
A. They weaken the atmospheric greenhouse effect. B. They are caused by the atmospheric greenhouse effect. C. They enhance the atmospheric greenhouse effect. D. They have no effect on the atmospheric greenhouse effect.
Which of the following elements has six valence electrons?
A) Be B) B C) C D) N E) O
Which of the following statements describe the Bible Belt?
A) stretches from Texas to Missouri B) based on Protestant denominations C) includes Catholicism D) stretches from Texas to Missouri; based on Protestant denominations E) all of the above