Water is the most abundant compound on Earth's surface, covering about
70% of the planet. Sea, lake, pound and river all are made up of water. From the picture of our planet, we can see that most of the surface of Earth are covered of water (blue in colour).
Water is the only common substance found in naturally in three common states of matter - liquid, solid, and gaseous states
. Water is a
molecule made of 2
hydrogen atoms and 1
oxygen atom. Its
formula is H
2O.
Water is essential for all life on Earth as well. Water usually makes up
55% to 78% of the human body.
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Water is the most abundant compound on Earth's surface, covering about 70% of the planet. Sea, lake, pound and river all are made up of water. From the picture of our planet, we can see that most of the surface of Earth are covered of water (blue in colour). 
Water is the only common substance found in naturally in three common states of matter - liquid, solid, and gaseous states. Water is a molecule made of 2 hydrogen atoms and 1 oxygen atom. Its formula is H2O.
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