Key Concepts and Vocabulary

Front

warmer

Back

A condition or period of higher temperature.

Front

colder

Back

A condition or period of lower temperature.

Front

dives

Back

To plunge into water or to descend quickly.

Front

above sea level

Back

A height that is higher than the average level of the sea.

Front

below sea level

Back

A depth that is lower than the average level of the sea.

Front

addition property of opposites

Back

The principle that the sum of a number and its opposite is zero.

Front

additive inverse

Back

A number that, when added to a given number, results in a sum of zero.

Front

difference

Back

The result of subtracting one number from another.

Front

decreased

Back

To become smaller or less in size, amount, or degree.

Front

increased

Back

To become larger or greater in size, amount, or degree.