The age of the Earth is:
a. 12.6 billion years.
b. 12.6 million years.
c. 4.6 billion years.
d. 4.6 million years.
e. 10,000 years
C
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Which of the following is not a mineral?
A) Liquid water B) Crystals grown in a laboratory C) Volcanic glass D) Piece of wood E) All of these are correct.
Radiometric dating shows that the oldest ocean crust is ____________________ years old, and the oldest continental crust is ____________________ years old.
Fill in the blank(s) with the appropriate word(s).
Where is the impact crater that possibly formed the iridium layer located?
A. Yucatan Peninsula of Mexico B. In the Mediterranean Sea C. Beneath the Arctic ice cap D. Meteor Crater, Arizona
The United States generates more electricity from ________ than from any other renewable energy source.
A. hydroelectric B. solar C. geothermal D. bioenergy E. wind