The advent of ____ allowed geologists to assign numeric dates to the geologic time scale
a. uniformitarianism
b. radiometric dating
c. relative dating
d. fossil succession
e. stratigraphic nomenclature
ANSWER: b
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By definition, an ore is a mineral rich in valuable metals. To be considered as an ore means that the
A) metals can be economically extracted to yield a profit. B) metals are extremely valuable. C) deposit is very rich and abundant in valuable metals. D) metallic minerals are very abundant.
When stable air is forced to lift as it passes over a mountain range, the air may become saturated and condensation may occur. In this case, the air is
A) stable. B) unstable. C) conditionally unstable.
A layer of dust or salt particles suspended above a region is called ____________________
Fill in the blank with correct word.
Chaos and anarchy thrived after the Soviet forces withdrew from Afghanistan, but the group known as __________ finally filled the power vacuum.
a. the Taliban b. Mujahideen c. the Northern Alliance d. the Islamic fundamentalists e. al-Qaeda 0