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  • Publicado : 12 de febrero de 2012
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Water is made up of two elements, hydrogen and oxygen. Its chemical formula is H2O.

Each molecule of water is made up of two hydrogen atoms bonded to a single oxygen atom.

Theexistence of water is essential for life on Earth.

Water has three different states, liquid, solid and gas.

The word water usually refers to water in its liquid state. The solid state of water is knownas ice while the gas state of water is known as steam or water vapor.

Water covers around 70% of the Earth’s surface.

The three largest oceans on Earth are the Pacific Ocean (largest), theAtlantic Ocean (second largest) and the Indian Ocean (third largest). More ocean facts.

Found in the Pacific Ocean, the Mariana Trench is the deepest known point in the world’s oceans.

Ocean tidesare caused by the rotation of the Earth and the gravitational pull of the Moon and Sun acting on ocean water.

Water from a sea or ocean is known as seawater. On average, every kilogram (2.2lb) ofseawater contains around 35 grams (1.2 oz) of dissolved salt.

The freezing point of water lowers as the amount of salt dissolved in at increases. With average levels of salt, seawater freezes at -2°C (28.4 °F).

The longest river in the world is the Nile River, it reaches 6650 kilometers in length (4132 miles).

The second longest river in the world is the Amazon River, it reaches 6400kilometres (4000 miles) in length.

The longest river in the USA is the Mississippi River, it reaches 6275 kilometers in length (3902 miles).

Water makes a good solvent with many sugar, salts and acidseasily dissolving in it. On the other hand oils and fats don’t mix well with water.

The water cycle involves water evaporating (turning into a gas), rising to the sky, cooling and condensinginto tiny drops of water or ice crystals that we see as clouds, falling back to Earth as rain, snow or hail before evaporating again and continuing the cycle.

Water in the form of ice is found at...
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