The Water Cycle. 75% of Earth’s surface is covered with ocean. 25% of the surface is land (7 continents). Maybe that’s why Earth is called the Water Planet. The atmosphere over all Earth also contains water in the form of vapour. But there are two kinds of water:.
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75% of Earth’s surface is covered with ocean.
25% of the surface is land (7 continents).
Maybe that’s why Earth is called the Water Planet.
The atmosphere over all Earth also contains water in the form of vapour.
But there are two kinds of water:
Salt wateris in the oceans
is everywhere else
Only about 3% of Earth’s water is fresh water.
Salt waterin the oceans
There are may types of plants and animals that live in the salt water oceans.
This heat energy causes evaporation.
evaporation ee va poh ray shun
When water evaporates, molecules of water become vapour and float up into the air. Only pure water can evaporate. The salt stays behind in the ocean.
condensation con den say shun
precipitation pree sip ih tay shun
(rain, snow, sleet, hail)
Some precipitation collects in lakes, and ponds. Even if water is green, we call it fresh water. Fresh doesn’t mean clean, it means not salty.
A lot of the precipitation runs off into streams and rivers where it flows back to the ocean. This is called runoff.
Precipitation that doesn’t soak into the ground and “runs off” the land to get back to the oceans.
Eventually, all fresh water gets back to the ocean where the cycle of evaporation, condensation, precipitationand runoffcan go on and on to supply fresh water to our planet.
A cycle is a wheel that is constantly turning
Earth’s water is in a constant cycle.It evaporates from the ocean, travels through the air, rains down on the landand then flows back to the ocean.
Evaporation speeds up when water is heated.
Earth’s atmosphere is warmer near the equator where the Sun’s ray are more direct. The north and south polar regions are colder.
This is why the areas around the equator where the world is hotter have more rain and humidity.
Some parts of the world seem to be very dry, but even in the desert, there is water.
Every living plant and animal contains water and there is water vapour in the air.
For millions of years, some of the rain water that falls has been soaking deep underground. You can find water in these aquifers almost anyplace you drill.
Water that is in the gas state.
Water molecules that have been evaporated.
Vapour is usually invisible but hot steam can be seen for a few seconds before it disappears.
Small droplets of water that appear on the ground in early morning. Dew can occur even with no clouds when humid air cools at night. Many small animals get the water they need from dew drops.
Air movements caused by uneven heating of the Earth and temperature differences.
Hot air rises, colder air sinks. The result is wind.
Big areas of underground water that can be found by drilling almost anyplace on Earth. This is also called the water table.
Drought (rhymes with out)
An usually dry period with less than normal amounts of rainfall.
An usually wet period with more than normal amounts of rainfall when rivers can’t carry the runoff.
The chemical formula for water.
H2 (2 hydrogen atoms) + O (1 oxygen atom)
( 1 water molecule)
Frozen H2O = ice
Liquid H2O = water
Gas H2O = vapor