Spring tides occur ________.
A. twice a month when the Earth-Sun and Earth-Moon lines are at a right angle to each other
B. twice a month when the Earth, Sun and Moon are fully aligned
C. once a month when the Earth-Sun and Earth-Moon lines are at an angle of 45° to each other
D. once a month when the Earth, Sun and Moon are fully aligned
E. once a month when the Earth-Sun and Earth-Moon lines are at a right angle to each other
Answer: B
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Which of the following statements regarding the origin of life is false?
A) Life originated on an Earth whose atmosphere contained no oxygen. B) Miller and Urey generated amino acids and many other organic molecules by shooting electric sparks through a model of Earth's early atmosphere. C) The first genes were probably made of DNA, not RNA. D) When certain lipids are added to water, they spontaneously form structures that resemble cell membranes.
A break or gap in the geologic record resulting from erosion or nondeposition or both is a(n) ____
a. inclusion b. cast c. formation d. extinction e. unconformity
A reverse fault forms when:
A) the hanging wall rock moves downward compared to the footwall. B) the hanging wall rock moves up along a dip-slip fault compared to the footwall. C) the fault dips at an angle steeper than 45 degrees. D) the fault dips at an angle less than 45 degrees.
Phytoremediation is:
A. A style of land use planning in agriculture B. Use of plants to increase agricultural production C. Use of specialized plants to clean up the environment D. A method crop rotation