Water (H
₂O) is a transparent, tasteless, odorless, and almost colorless chemical substance and covers over 70% of Earth's surface.
No known life can live without it.

Lakes, oceans, seas, and rivers are made of water.
Precipitation is water that falls from clouds in the sky.
It may be rain (liquid) if it is warm, or it may be frozen if it is cold.
If water gets very cold (below 0 °C (32 °F)), it freezes and becomes ice, the frozen variant of water.
 If water gets very hot (above 100 °C (212 °F)), it boils and becomes steam or water vapor.

Water has been present on Earth since its earlier days and is constantly moved around it by the water cycle.
Water is very important for life, probably essential.
 However, some studies suggest that by 2025 more than half the people around the world will not have enough fresh water.
Water (H
₂O) is a transparent, tasteless, odorless, and almost colorless chemical substance and covers over 70% of Earth's surface. No known life can live without it.
Lakes, oceans, seas, and rivers are made of water. Precipitation is water that falls from clouds in the sky. It may be rain (liquid) if it is warm, or it may be frozen if it is cold. If water gets very cold (below 0 °C (32 °F)), it freezes and becomes ice, the frozen variant of water.  If water gets very hot (above 100 °C (212 °F)), it boils and becomes steam or water vapor.
Water has been present on Earth since its earlier days and is constantly moved around it by the water cycle. Water is very important for life, probably essential.  However, some studies suggest that by 2025 more than half the people around the world will not have enough fresh water.
Water