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The ocean may be defined as _____.

How do stars spend their lives?

Passive margins are _____.

Eratosthenes was the Greek astronomer, philosopher, and poet of Cyrene who _____.

Terrigenous sediments come from _____.

Which U.S. agency is responsible for oceanographic research related to national defense?

The Mid-Atlantic Ridge is a(n) _____.

_____forms mainly from shells of the amoeba-like foraminifera; small, drifting molluscs called pteropods; and tiny algae known as coccolithophores.

_____ sediments are minerals that have precipitated out of water.

_____ are one of the surface expressions of plumes of magma rising from relatively stationary sources of heat in the mantle.