At the beginning of each World War, the U.S. was reluctant to become involved and practiced the policy of __________
Fill in the blank(s) with correct word
isolationism
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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.
What can lithified or ancient sand dunes tell us? What will be an ideal response?
In general, newspaper recycling is
A) rare because demand in Europe and Asia has fallen. B) rare but the demand is quite high and steady. C) common and widespread, but the demand is quite variable. D) common and widespread, and the demand remains very consistent and high.
Biodiversity enhances human food security because it ________
A) decreases the number of predators B) means that there is genetic uniformity C) is a potential source of new food items or new genetic varieties of existing foods D) reduces the number of pollinators available to any one plant species E) increases the number of available pathogens