​All weather is related to water. Water constantly moves in a cycle from earth to atmosphere.

​​Influence Weather

​Water slowly wears away rock and carries away sediment. Glaciers have scraped away rock and soil.

​​Shaping Earth's Surface

Every living thing is largely made up of water. Without water all plants and animals would dry up and die.

Supporting Life

Clean drinking water is essential for all humans. Water is used largely for agriculture.

Supporting Human Activities

​Water's Role on Earth

Matter is made up of tiny particles called atoms. Atoms join other atoms to make molecules. A water molecule is made of two hydrogen atoms and one oxygen atom.

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What is the Structure of a Water Molecule?

What makes water a polar molecule?

The hydrogen molecules atoms have a small positive charge. Water has a positive charge at one end and a negative charge on the other. This means it has polarity.

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​Most of Earth's water is in liquid form. Earth has rivers, lakes, and oceans.

Liquid

Liquid water can change into an invisible gas called water vapor. Water vapor is a gas and it can not be seen.

Water Vapor

​Water expands when it freezes. Ice is less dense than liquid water., because the molecules have separated.

Ice

​What States of Water Occur on Earth

What are Water's Four Properties