Carbon dioxide, ____________________, nitrous oxide, and ____________________ are the greenhouse gases that appear to be responsible for the enhancement of Earth’s atmospheric greenhouse effect
Fill in the blank with correct word.
ANSWER: methane; chlorofluorocarbons
chlorofluorocarbons; methane
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Which of the following is correct in regards to the geologic time scale?
A) An epoch is composed of one or more periods. B) The largest defined unit is an eon or, according to some, a supereon. C) An era is the smallest unit of geologic time. D) Every period is composed of 2 epochs.
Which type of biologically important molecules includes many cyclic hemiacetals?
A) carbohydrates B) lipids C) proteins D) none of these
How is a volcanic neck different from a volcanic pipe?
A) Volcanic necks are longer and bring materials up from the mantle. B) Volcanic pipes connect to shallow magma chambers. C) Volcanic pipes are shorter. D) Volcanic necks are shorter and connect to shallow magma chambers.
A large flood in a river may cause abrupt shifts leading to the carving of a new channel. The point at which this change occurs is a(n) ________
A) input B) threshold C) type of dynamic equilibrium condition D) type of metastable equilibrium