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Oxygen is supplied to the atmosphere by __________.

The most active, restless parts of the Earth’s crust are located at the __________, which is why volcanoes, mountains, and fault lines are common features often found there.

Although scientists do not know with certainty the composition and structure of the Earth’s interior, indirect evidence, including earthquake body waves, has led scientists to believe the Earth is made up of four regions which, in order from the center of the Earth outward, are __________.

Most active volcanoes are located in an area along the margins of the Pacific Ocean known as the __________.

Hardness is a property used for classification of minerals using the Mohs scale. Which of the following is the softest mineral on the scale?

Rocks formed by the alteration of preexisting rock in response to the effects of pressure, temperature, or the gain or loss of chemical components are classified as __________.

The __________ theory states that the Earth’s lithosphere is made up of a series of solid sections or segments that are constantly interacting with one another in very slow motion.

Solid, cohesive, natural aggregates of minerals are called __________.

The geologic time scale uses four time units to describe relative geologic time. From largest (longest) time unit to smallest (shortest), they are __________.

Although they may have less total energy than some other types of storms, __________ are the most violent of storms.