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100

Water that contains low concentration of dissolved salts.

What is fresh water

100

Three places where freshwater is found. 

What are rivers, lakes and streams.

100

The names of the five oceans.

What are the Pacific, Atlantic, Indian, Arctic, and Southern Oceans. 

100

The movement of water as it changes its state and moves from one place to another.

What is the water cycle.

100

A deep valley with steep sides, often with a stream or river flowing through it.

What is a canyon.

200

Water that has soaked into the earth, often between saturated soil and rock.

What is groundwater?

200

A relatively flat area next to a river's banks that experiences periodic flooding.

What are floodplains?

200

The movement of water in a river, lake, or ocean that moves in a specific direction.

What is current?

200

An underground section of rock or soil that holds large amounts of water.

What is an aquifer?

200

The distance between the top of one wave, and the top of the next.

What is wavelength?

300

Snow or rain, that contains small amounts of sulphuric or nitric acid.

What is acid rain?

300

The movement of the ocean surface because of the gravitational pull of the moon.

What are tides?

300

A back and forth movement of water in a lake that makes the surface rise and fall.

What are seiche waves?

300

An area where freshwater from rivers and saltwater from the oceans mix to make moderately salty (saline) water.

What is an estuary?

300

A chemical often added to water to kill bacteria.

What is chlorine?

400

A large mass made of ice and snow that moves slowly over land.

What is a glacier?

400

An area of high land that causes all water to run to a common destination.

What is a watershed?

400

The highest point in North America that divides waters flowing into the Pacific ocean from those flowing into the Atlantic Ocean.

What is the continental divide?

400

The upward movement of water through soil because of the attraction of water molecules to soil particles.

What is capillary action?

400

Small rivers or streams that flow into larger rivers.

What are tributaries?

500

The formation of clumps from particles suspended in a fluid.

What is floculate?

500
The watering of crops by makeing water from a river, lake, or underground water source, go to the crops to grt watered.
What is Irrigation.
500
A layer of rock, clay, or silt wich water then cannot move quickly.
What is Aquitard.
500
Mixing of lower and upper levels of a form of, useually caused byconvection currents.
What is overturnes.
500
Small rivers or strteams that join into a lager river.
What is Tributaries.