Suppose an isotope has a half-life of 50 million years, and 1/8 of the sample remaining consists of that isotope. What is the age of the rock from which it was taken?
A)150 million years
B)300 million years
C)400 million years
D)600 million years
E)800 million years
A
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What created Earth's moon?
A) The expulsion of rocky mantle after a collision with a planetary body B) The initial big bang expansion event C) The formation of a new star D) None of these choices
The term "bycatch" refers to ________.
A. animals other than fish caught in nets B. all fish caught in nets C. fish that are processed on board the fishing vessel D. fish other than the targeted species, often thrown away E. None of these is correct.
Coal strip mines can be difficult to revegetate because of the acidity resulting from weathering of sulfur in spoils.
Answer the following statement true (T) or false (F)
The principle of Uniformitarianism assumes that physical processes that operate in the modern world also operated in the past, at quite different rates.
a. true b. false