The impact of humans on the global sulfur cycle is
A) very small since sulfur emission has been banned by international treaty.
B) very small at the global scale but can be large locally.
C) large at the global scale but usually small locally.
D) moderate and relatively evenly distributed across space.
B) very small at the global scale but can be large locally.
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The U.S. General Mining Act of 1872, although encouraging of the domestic mining industry, also ________
A) makes mining unprofitable except for the largest corporations B) opens mining rights to foreign nations which stake claims on U.S. land C) gives away resources located on public land almost for free D) has allowed mining in urban centers with dense commercial development E) has pollution and remediation clauses that are too strict
The 41,000 year variation in the tilt of Earth's axis is called the:
a. precession cycle. b. eccentricity cycle. c. obliquity cycle. d. unicycle.
One difference between prokaryotic and eukaryotic cells is that
A. the DNA of prokaryotic cells is found in linear chromosomes, whereas the DNA of eukaryotic cells is found in a single circular chromosome. B. eukaryotic cells are generally smaller than prokaryotic cells. C. prokaryotic cells have a nucleus, whereas eukaryotic cells do not. D. prokaryotic cells have existed on Earth far longer than eukaryotic cells.
The large tapering cylindrical vapor-emitting structures associated with power plants are
A) smokestacks from a coal-fired power plant. B) special wind turbines that capture swirling wind to produce electricity. C) towers used to cool water heated by a coal-fired power plant. D) combustion chambers used to burn natural gas to generate electricity.