3.1 Meanings/Short definitions:
1. Rock – A rock is an mix of one or more minerals.
2. Ore – A rock from which minerals are mined.
3. Ferrous minerals – Ones containing iron as a constituent.
4. Petroleum – Thick layer liquid fossil fuel .
5. Solar energy – Heat and light energy captured from the sun.
6. Wind energy – Energy possessed by moving air.
7. Geothermal energy – Energy obtained from inside of the earth.
8. Tidal energy – Energy generated from tides.