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100

The exact position of a place on Earth using latitude and longitude.

Absolute Location

100

The gradual wearing away of Earths surface by wind, water, or ice.

Erosion

100

One of Earths seven large landmasses.

Continent

100

The imaginary line Earth spins around, tilted at an angle of 23.5 degrees.

Axis

200

Water that is partly salty and partly fresh.

Brackish 

200

A tool on a map that shows directions.

Compass Rose

200

Plants that grow naturally in a particular region.

Flora

200

The farming of land or raising of animals for food and goods.

Agriculture

300

A flat, low-lying area along the coast.

Coastal Plain

300

The weather conditions in an area over a long period of time.

Climate

300

The natural world, including air, water, land, plants, and animals.

Environment

300

The height of a place above sea level.

Altitude

400

A land area drained by a river and its tributaries.

Basin

400

A circular coral reef surrounding a lagoon.

Atoll

400

A triangle area of land formed where a river flows into a larger body of water.

Delta

400

The level of the lands surface in relation to sea level.

Elevation

500

A group or chain of islands.

Archipelago

500

A narrow, steep valley created by glaciers and filled with sea water.

Fjord

500

The high point that separates river systems flowing toward opposite side of the continent.

Continental Divide