How are faults, hypocenters, and epicenters related?
What will be an ideal response?
A fault is the slip plane along which the movement of an earthquake occurs. The hypocenter is the trigger point on the fault at which the slippage occurred. The epicenter is the surface projection of the hypocenter—the earthquake location that would be determined by triangulation.
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Scientific theories are
a. frequently overturned and changed because they are, in fact, just theories. b. overturned on a regular basis at periodic scheduled meetings of the scientific community to evaluate the validity of all scientific theories. c. never overturned. d. rarely overturned unless new evidence discredits them. e. overturned only as a result of Supreme Court decisions.
The mass of an atom of 12C is exactly 12 atomic mass units. Which of the following describes a mole of 12C atoms?
A) a sample which weighs exactly 12 atomic mass units B) a sample which contains 6.02 x 10^23 atoms of 12C C) both a and b D) neither a nor b
The Central American Free Trade Agreement's (CAFTA) purpose is to __________ the US and the countries of Central America.
a. increase wealth for b. diminish human rights in c. provide labor for d. reduce trade barriers between e. balance wealth between
Weeds are types of
A) pathogens that spread disease to humans or between plants. B) animals or plants that can cause disease. C) plants that can rapidly spread through lightly airborne seeds. D) pests that may threaten our health or compete with our food.