Easiest
Easy
Medium
Difficult
Hard
100

An area of land that drains into the ocean by a river

Riverbasin

100

An ecosystem where all water runoff drains into a single body of water

Watershed

100

Small river or stream that flows into a larger river or stream; a branch of the river

Tributaries

200

Attraction between molecules of the same substance

Cohesion

200

Water- due to its polarity and ability to dissolve many different solutes

Universal solvent

300

Underground water that is held in the soil and in previous rocks

Ground Water

300

A body of rock or sediment that stores groundwater and allows the flow of groundwater.

Aquifer

300

The amount of energy required to raise the temperature of 1 gram of a substance by 1 degree Celsius

Specific Heat

400

Impassable, not allowing passage through (such as by a liquid)

Impermeable

400

The continuous process by which water moves from Earth's surface to the atmosphere and back.

Water Cycle

500

Does not contain any salt water and can be rivers, lakes, streams, ponds, and wetlands

Freshwater

500

A liquid substance capable of dissolving other substances

Solvent
500

An attraction between molecules of different substances

Adhesion

500

Molecule with an unequal distribution of charge, resulting in the molecule having a positive end and a negative end

Polar Molecule

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