If an isotope has a half-life of 50 million years and an 1/8 of the sample remaining consists of that
isotope, the age of the rock from which it was taken is:
a. 400 million years.
b. 300 million years.
c. 150 million years.
d. 800 million years.
e. none of the above
C
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Indicate whether this statement is true or false.
Current models of the gasoline-electric car
a. may get up to 30 miles per gallon on the freeway b. get up to 51 miles per gallon c. cannot be used in wet weather d. do not have the ability to climb steep hills e. get up to 35 miles per gallon
The matter and energy laws tell us that we can recycle ____.
A. both matter and energy B. neither matter nor energy C. matter but not energy D. energy but not matter E. nothing and everything
Most of Earth's carbon is stored in the ________.
A. atmosphere B. hydrosphere C. biosphere D. lithosphere