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When did the first abundant fossil evidence appear?

Earth’s atmosphere is divided vertically into four layers on the basis of temperature. The layers, in order from bottom to top, are ________.

________ dunes are long, high, sand dunes parallel with the prevailing wind direction.

Which of the following is not necessary for the formation of metamorphic rock?

What is the inert gas, daughter product of the radioactive isotope, K-40?

Hornfels are metamorphic rocks produced at great depths and high temperatures associated with regional metamorphism.

Hotter objects radiate ________ total energy per unit area than do colder objects.

For a radioactive isotope like Uranium-235, what does the 235 indicate?

Hotter objects radiate ________ total energy per unit area than do colder objects.

Which of the following refers to the investigative process by which geologists identify and match sedimentary strata and other rocks of the same ages in different areas?