Some facts about water...... • 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. • The existence 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 known as 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), the Atlantic 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 tides are 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) of seawater 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).
Posted on: Wed, 29 Jan 2014 09:03:45 +0000
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