Natural gas is primarily composed of ________
A) methane
B) oxygen
C) carbon dioxide
D) nitrogen
E) hydrogen
A
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A habitat that is isolated by roads, agriculture, or urban development is called a ____________________.
Fill in the blank(s) with the appropriate word(s).
What percentage of Earth's freshwater is locked up in polar ice caps?
A) 3% B) 70% C) 20% D) 30% E) 97%
Radium-226 is a common isotope on Earth, but has a half-life of about 1600 years. Given that Earth is some 5 billion years old, why is there any radium at all?
A. Radium-226 and Radium-218 undergo a series of transmutation reactions of alpha and beta decay to repeatedly become one another approximately every 1600 years. B. Radium-226 is a "daughter" isotope and the result of the radioactive decay of uranium. C. Radium-226 is one of several self-transmutating isotopes of the elements of the periodic table and is able to replenish itself so that it is never depleted. D. Radium-226 and Astatine-218 are converted back and forth via transmutation to one another at each of their respective half-life cycles.
Find the largest cold front located on the map. The likely air mass to the west of the cold front is a ________ mass that is likely to be ________ than the air mass to the east.
A) mT; moister
B) mP; moister
C) cP; drier
D) cP; moister