百花开自然学校 2020-01-26 17:43:19

【Wood】
Look at this house. The builders used wood.
The wood is a resource.
Look inside the houses. The builders used wood for the stairs.

【How do logs become lumber?】
This truck carries logs.
The logs come from trees.
The builders do not use the logs yet.
First the logs go to a sawmill.The workers cut the logs into flat boards.The boards are different sizes.
Next the workers dry the boards.
The boards dry in an oven.
Then the boards are stronger.
Now the boards are lumber.
The builders can buy the lumber at a store.

【Stone】
The builders used stone. The stone is a resource, too.
The wood is a resource.
The builders used stone for the floor.

【natural resources】
The wood and the stone come from nature.
The wood and the stone are natural resources.
All natural resources come from nature.

【sand】
Many houses have windows.
The windows are glass.
People use sand to make glass.
The sand comes from stone.
The stone comes from nature.

【Where do builders get stone?】
Some stone is under the ground.
The workers dig up the stone.
The builders do not use the stone yet.
First the stone must go through a crusher.
A crusher breaks the stone into pieces.
Next the workers load the pieces onto many trucks.
The pieces go to many factories.
The factories make tiles from the stone.
Then the builders use the tiles in houses.
People use wood to build houses.
Have you seen a house made of wood?
People use stone to build, too.
Have you seen a house made of stone?