Educational worksheet about non-renewable resources, including fossil fuels and energy sources.

Here is the completed worksheet with explanations for each answer.

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1. Complete these sentences, using the words in the box below. You may need to use some words more than once.

✔ Fuels contain a store of energy called _chemical_ energy.
→ Fuels like coal, oil, and gas store energy in their chemical bonds. This is known as *chemical energy*.

✔ When fuels are burned the _chemical_ energy is changed into _heat_ energy.
→ Burning (combustion) breaks chemical bonds and releases energy primarily as *heat*.

✔ Some fuels, called _fossil_ fuels, were formed from the remains of plants or _animals_.
→ Fossil fuels come from ancient organic matter — both *plants* and *animals* that lived millions of years ago.

✔ Coal was formed from dead _plants_. The plants were buried in _mud_, which stopped them _rotting_ away.
→ Coal forms from ancient swamp plants. When they died, they sank into *mud*, which preserved them by preventing *rotting* (decomposition).

✔ More mud buried and squashed them. The mud turned into _rock_ and the dead plants turned into _coal_.
→ Over time, pressure and heat turned the mud into *rock* (sedimentary rock), and the plant material became *coal*.

✔ Oil and gas were formed from plants and _animals_ that lived in the sea. When they died they _fell_ to the sea bed and were buried. Over _millions_ of years they were squashed and heated, and turned into _oil_ and _natural gas_.
→ Marine organisms (both *plants* and *animals*) sank (*fell*) to the ocean floor. After *millions* of years under pressure and heat, they became *oil* and *natural gas*.

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Word Bank Used:
- chemical ✔
- heat ✔
- fossil ✔
- animals ✔
- plants ✔
- mud ✔
- rotting ✔
- rock ✔
- coal ✔
- fell ✔
- millions ✔
- oil ✔
- natural gas ✔

*(Note: “nuclear energy” is not used here — it’s for question 2.)*

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2. Write “coal”, “oil”, “natural gas” or “nuclear energy”.

✔ Car → _oil_
→ Most cars run on gasoline, which is refined from *oil*.

✔ Fireplace with burning logs/coal → _coal_
→ This image shows a fireplace with black lumps — typical of *coal*. (Note: Though wood is also burned in fireplaces, the visual cue here matches coal.)

✔ Stove with gas burner → _natural gas_
→ Gas stoves use *natural gas* piped into homes.

✔ Nuclear power plant (with cooling towers) → _nuclear energy_
→ The large cooling towers and reactor building indicate a *nuclear energy* plant.

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✔ Final Answers Summary:

Question 1:
1. chemical
2. chemical
3. heat
4. fossil
5. animals
6. plants
7. mud
8. rotting
9. rock
10. coal
11. animals
12. fell
13. millions
14. oil
15. natural gas

Question 2:
- Car → oil
- Fireplace → coal
- Stove → natural gas
- Power Plant → nuclear energy

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