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EARTH’S WATER

WATER ALL AROUND

Look around you.

Water is everywhere.

Water falls from the sky and flows overland.

It goes into the ground and fills bodies of water.

WATER AS A LIQUID

Most of our planet is covered with water.

Water is in oceans, rivers, lakes, and ponds.

Water falls from clouds as rain.

All this water is in a liquid state.

Liquid water can flow from one place to another.

It takes the shape of whatever it is in.

TEMPERATURE

Water can change from a liquid state to other states.

Water changes from one state to another because of temperature.

Temperature is how hot or cold something is.

WATER AS A SOLID

Think about rain falling from the sky.

The rain is in a liquid state.

What happens if the weather gets very cold?

That’s right—the rain freezes!

When rain freezes, it changes from a liquid state to a solid state.

The solid state of water is ice.

Ice is hard, and it has its own shape.

Snow is tiny pieces of ice.

Some mountains have huge pieces of ice, called glaciers.

Icicles are another form of ice.

What happens to the ice if the weather gets warm?

The ice melts and becomes a liquid again!

WATER AS A GAS

What happens to liquid water when the temperature is very hot?

Puddles go away after the sun comes out.

Where does the liquid water go?

Energy from the sun causes the water to change state.

The water changes from a liquid state to a gas state.

The water evaporates, or goes into the air.

Water in a gas state is water vapor.

Water vapor is tiny bits of water in the air.

You can’t see water vapor, but you can feel it.

Water vapor makes hot days feel sticky.

Water vapor can change when the temperature gets lower.

The water vapor condenses and becomes liquid water.

Then you can see it again!

WATER FOR LIFE

Plants and animals need water.

Water helps everything on Earth stay alive.

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