The Jurassic Period of geologic time was an interval marked by a great number of glacial fluctuations that began about 2.6 million years ago and ended around 10,000 years ago
a. True
b. False
Indicate whether the statement is true or false
False
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Gamma rays released by radioactive compounds like plutonium is a form of kinetic energy called _________________ radiation.
Fill in the blank(s) with the appropriate word(s).
The number of species that disappear each year is defined as the rate of _____________.
Fill in the blank(s) with the appropriate word(s).
What type of rock likely composes the landscape shown in this photograph from the Investigation?
A. volcanic rocks, probably basalt B. metamorphic rocks C. granite D. sedimentary rocks
With increasing distance from an oceanic ridge,
A. the rocks become younger. B. the rocks become older. C. the rocks' ages alternate between younger and older. D. All of the choices; different patterns occur at different ridges.