The geologic timescale was originally developed by using radiometric dating.

a. true
b. false


b. false

Environmental & Atmospheric Sciences

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Which of the following cloud types is found at the highest elevation above the Earth's surface?

A. cumulus congestus B. noctilucent C. cumulonimbus D. cirrocumulus

Environmental & Atmospheric Sciences

Although the mantle is almost solid, mantle rock is so hot that it is soft enough to flow with a speed of

a. 15 mm/yr b. 15 cm/yr c. 15 ft/yr d. 15 m/yr

Environmental & Atmospheric Sciences

In general, marine biodiversity is greatest in

A. the Atlantic Ocean. B. the Pacific Ocean. C. the bottom region of the ocean. D. moderate ocean depths. E. the surface region of the ocean

Environmental & Atmospheric Sciences

How do sedimentary rocks reveal ancient environments?

What will be an ideal response?

Environmental & Atmospheric Sciences