Which of the following is generally most associated with longer days?
A. less insolation
B. more heating-degree days
C. fewer heating-degree days
D. more insolation
Answer: D
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The two ways in which humans have most interfered with the carbon cycle are
A. clearing trees and plants and aerobic respiration. B. aerobic respiration and burning of fossil fuels. C. respiration and photosynthesis. D. burning of fossil fuels and clearing trees and plants. E. respiration and clearing trees and plants.
Give an example of how an invasive species can cause ecological or economic harm
What will be an ideal response?
Scientists have direct evidence of the Earth's structure to
A) the inner core. B) the upper mantle (~250 km (155 mi)). C) about 2 km (1.2 mi) from the surface. D) 10 km (6 mi) from the surface, based on the deepest well shaft.
The United States presently
A. exports more oil than it uses. B. generates enough oil in refineries to make up for the amount it cannot supply through drilling. C. is self sufficient in its oil production and use. D. imports more than half of the oil it uses.