Gas
Natural gas is a fossil fuel. It is a gas that comes from sea creatures that died millions of years ago and it is non-renewable. We can burn gas to heat our homes and cook our food. Power stations can burn gas to make electricity.
Geothermal
Geothermal energy comes from the hot magma in the centre of the Earth. Underground water heats up as it flows near the magma. Geothermal energy can be used to make electricity.
Greenhouse gas
Greenhouse gases in the atmosphere trap heat on Earth. Normally this is good because this temperature supports life as we know it. But extra greenhouse gases in the atmosphere cause the Earth to heat up more. Carbon dioxide is a greenhouse gas.
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