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In terms of geologic time, we are living in the __________ eon which began about 541 millions of years ago and the Holocene Epoch which began about 0.01 millions of year ago at the end of the last ice age.

Correlation and the use of index fossils are used to determine __________.

Most, but not all, geologists believe the Earth’s age to be about __________ years.

Hurricanes derive their energy from

An air mass derives its characteristics from the __________.

Minerals are classified based on their physical and chemical properties which include __________.

Storms generally occur along the area where two air masses meet, which is called a(n)

Most earthquakes are caused by __________.

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.