What is a half-life?
A. It is the time needed until 1/2 of the radiation is gone.
B. It is the time it takes for 1/2 of the material to undergo radio decay.
C. It is half of the lifetime of the radioactivity in a sample.
D. It is the time it takes for 1/2 of the material to decompose.
E. all of the above
Answer: B
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The horizontal movement of the atmosphere is known as ________
Fill in the blank(s) with the appropriate word(s).
An extensive, continuous mass of ice occurring on a continental scale is known as a(n)
A) piedmont glacier. B) tidal glacier. C) ice sheet. D) tidewater glacier.
Which of the following best illustrates the connection between climate and geologic processes?
A) Water coming off a cooling magma emplaces metallic ores B) Hydrothermal vents near a mid-ocean rift create chimneys of mineral deposits C) Heavy rainfalls trigger debris flows D) Arid climates make sea level drop
Coal forms from ancient plant remains originally deposited in swamps and marshes. The original energy content of the coal was derived from the sun
Indicate whether this statement is true or false.