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We can use it to make cups, bottles and bags.
plastic
It is also black. But it is a kind of liquid.(液体)
Cars need it.
oil
It is our home. We live on it. It is a circle(圆形).
We should protect it.
Earth
It is black and hard. We can burn it to get energy.
Unit7 Protect the Earth
It’s important.
We use it
every day.
We use it
to clean
things.
Water
Most of it
comes from
coal and oil.
It’s useful.
Energy
We use them
to make a lot
of things.
They can keep
the air clean.
We use it
to make
bags and