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What is this?

The man has an umbrella in his hand.

It is open.

He has it over his head.

Why?

Because it is raining.

Water is coming down from the sky.

The water is raining.

Rain is coming down.

Rain is falling.

It is raining.

The rain made the man put up his umbrella.

That was the effect of the rain.

Today is Monday.

Yesterday the sun was bright.

There were no clouds in the sky.

Today there are dark clouds in the sky.

They come between us and the sun.

The dark clouds keep the light of the sun from us.

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The rain comes down from the clouds on me.

It comes down on my head.

The rain comes down from the clouds on us.

It comes down on our heads.

Why is it raining today?

Yesterday the weather was good.

The sun was bright.

The air was warm.

Today the weather is bad.

The rain is coming down.

The wind is blowing.

It is cold and the rain makes us wet.

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Tomorrow the weather may be worse.

It may be very cold.

All the water may be ice.

Snow may be coming down making everything white.

Will tomorrow be like this?

Is this winter or summer?

Or tomorrow the weather may be better.

The sun may be bright again.

The air may be warm agin and the streets may be dry again.

Will tomorrow be like this?

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What are the causes of these changes in the weather?

Change?

What is that?

Here is a line.

Here is a change in the direction of the line.

This bird was wet.

It was in the rain.

Now it is dry.

That is a change.

It was wet.

It is dry.

What is the cause of these changes in the weather?

Why are there these changes of weather?

There was not one cause only.

There are numbers of causes.

Changes in the heat which comes to us from the sun are one cause of changes of weather.

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The amount of heat which the earth gets from the sun is different from time to time.

There are changes in the sun.

If you take a look at sun through a bit of dark glass you may see small marks on the face of the sun.

Amount?

One dollar is a small amount of money.

A million dollars is a great amount of money.

A drop of rain is a very small amount of water.

There is a small amount of water in this glass.

There is a great amount of water in the sea.

This is the sea.

Those are ships which are on the sea.

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Changes in the heat which comes to the earth from the sun are one cause of changes in the weather.

This discovery is new.

A man of science made the discovery in 1944.

He made it by measuring the heat which comes to the earth every day from the sun.

The amount of heat is different from day to day.

On some days the sun sends more heat to the earth.

On other days it sends less heat to the earth.

There is more water in this glass than in that.

We are making new discoveries every day.

Columbus made the discovery of America in 1492.

Columbus came to America in his ship in 1492.

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What were some other great discoveries?

One of them was fire.

Fire is very great use to us.

It gives us heat.

Another great discovery was the wheel.

Wheels are round.

They go round.

A cart

They are of very great use to us.

Another great discover was clothing.

What are these?

These are some other sorts of clothing.

The making of cloth was a great discovery.

This is how we make cloth.

These are threads.

They go across from one side to the other of a frame.