What evidence led scientists to believe that waves travel at a greater velocity inside Earth?
A) Studies of earthquake signals via sensors located deep inside drill holes prove it.
B) Refraction of energy waves is most efficient at shallower depths.
C) Refraction of energy waves is most efficient along short paths.
D) Average velocity is faster when the seismograph is farther from the focus of the earthquake.
Answer: D
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What is the main problem with the amount of carbon dioxide we have added to the atmosphere over the last several decades?
A. The amount released has overwhelmed the natural removal processes. B. Significant amounts of it have been absorbed by the oceans resulting in lower than expected sea levels. C. The temperature of the atmosphere is predicted to fall sharply in the coming decades. D. It has stimulated the growth of trees in rainforests around the world.
A(n) ____________________ consists of populations of different species living in a particular place and potentially interacting with each other
Fill in the blanks with correct word
A form of a biome is largely predicted by its
A) diversity of plant and animal species. B) diversity of soil microorganisms. C) temperature and rainfall. D) distance from the ocean.
The Mount Pinatubo eruption in June 1991 affected the atmosphere in all of the following ways except which?
A) The atmospheric albedo increased. B) An increase occurred in the amount of energy absorbed in the atmosphere. C) A worldwide decrease in surface temperatures occurred in the two years after the eruption. D) A decrease in atmospheric aerosols.