Fill in each blank with the correct word from the lesson.

1. Solar panels turn sunlight directly into _______.
2. Burning fossil fuels releases the carbon stored in them as _______ — the main gas driving climate change.
3. Most of our energy comes from coal, oil, and natural gas — called _______ fuels.
4. The good news is that renewable _______ sources never run out.
5. The immense heat and _______ slowly transformed these remains into coal, oil, and natural gas.

Choose the best option for each question.

1. What are fossil fuels made from?
   a) Rocks and mineralsb) Remains of ancient living thingsc) Seawater evaporationd) Volcanic lava
2. Why are fossil fuels called 'non-renewable'?
   a) They are found only in one countryb) Once used, they cannot be replaced in a human lifetimec) They cannot be burned safelyd) They don't provide energy
3. Which of these is a renewable energy source?
   a) Coalb) Natural gasc) Petrold) Solar energy

Write T for True or F for False in the brackets.

1. Remains of ancient living things is one of the key concepts in the lesson on What if it Finishes?.
2. Rocks and minerals is the main topic of this lesson.
3. Once used, they cannot be replaced in a human lifetime is one of the key concepts in the lesson on What if it Finishes?.
4. They are found only in one country is the main topic of this lesson.

1. In your own words, explain what What if it Finishes? means.
2. List two things you learned from this lesson on What if it Finishes?.