Words of This Topic
| Word | Meaning |
| Acid rain | Rain that brings down acids formed in the air |
| pH value | The number that tells how acidic or alkaline a liquid is |
| Oxide | A compound made when an element joins with oxygen |
| Carbonic acid | The weak acid made when carbon dioxide joins with water |
| Sulphuric acid | The strong acid formed from oxides of sulphur |
| Nitric acid | The strong acid formed from oxides of nitrogen |
| Fossil fuel | Fuel taken from under the ground, such as coal, petrol and diesel |
| Renewable energy | Energy that does not run out, such as hydroelectricity and solar energy |
| Indicator | A substance that changes colour to show whether something is acidic or alkaline |
| Recharge | The way water that has been used is filled up again by rain |
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