| What things have
energy? |
and |
What kinds of
work do they do? |
| The sun |
a) It lights
the dark. b) It heats things. |
|
| . |
. |
. |
| Wind |
It moves things. |
|
| . |
. |
. |
| The Earth (it's hot deep down!) |
It heats things. |
|
| . |
. |
. |
| Moving water |
It moves things. |
|
| . |
. |
. |
|
The energy sources above
are what we call primary (first) sources of energy. They've been around
since the Earth was formed, long before there was anything living. Other
sources of energy only became available after life started on the Earth.
The first living things to appear on
Earth were the algae and seaweeds in the oceans..
They were the first things to use energy! |