________ is a frothy volcanic glass with so much void space that it can actually float.

A. Obsidian
B. Sponge rock
C. Lava
D. Pumice
E. A floater

Answer: D

Environmental & Atmospheric Sciences

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The friction of fluid flow is called ____________________

Fill in the blank with correct word.

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How much of the water in the world ocean is involved in surface currents?

a. 1% b. 10% c. 20% d. 50% e. 90%

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Without greenhouse gases, earth's temperature would be

A. 0°C. B. 15°C. C. 68°C. D. -18°C.

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Home-based manufacturing was known as

A) home-built manufacturing. B) family business. C) cottage industry. D) small-scale manufacturing. E) sustenance manufacturing.

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