Thames & Kosmos Global Water Quality handleiding

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Carried along

by the wind

Precipitation and

seepage

Evaporation and

cloud formation

Surface

runoff

Groundwater

Ocean

Ice

EXPERIMENT 3 Dissolving in water

Water Cycle

Earth’s water is always in motion. Large quantities run in warm or

cold streams through the oceans — not just on the surface, but

at the bottom of the ocean as well. In addition, the sun’s heat

evaporates huge quantities of ocean water, especially in warmer

regions. The rising water vapor cools off as it reaches higher layers

of air, where it forms clouds consisting of fine water droplets or ice

crystals. The wind then moves these clouds around. Sooner or later,

it starts to rain — sometimes over the ocean, sometimes over dry

land. On land, the water forms rivulets, rivers, and seas, it wets the

ground, it forms groundwater, and it eventually flows back into

the ocean, thus completing the water cycle.

Explanation:

At first, you can easily

see the grains of salt

in the water. When

you stir, they seem to

disappear, as the salt

dissolves in the water.

But it’s still there! After

a few days, the water

evaporates and you can

once again see the salt

as little crystals on the

bottom of the cup.

Global Water Quality Manual 2013.indd 9 2/7/13 10:22 AM

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