Unit 4 Passage 2

1. Jinee learned that the Earth is getting hotter year by year because heat is trapped in the air.
4. Ian studied chemical compounds formed when oxygen mixes with other elements.
6. Julia learned about a gas released when fuel is burned.
8. Yuna learned about energy made from ancient plants and animals buried underground.
9. Elsa explained energy sources that can be used again and again without running out.
12. Yuna described everything around us, including air, land, animals, and people.
13. Sunny said we should care for nature so it is not damaged or harmed.
17. Sera read about tiny particles in the air that can enter the lungs.
18. Julia studied harmful substances in air and water that make the planet unhealthy.
19. Jinee read about a liquid resource taken from deep underground and used as fuel.
20. Julia described using moving air to create electricity.

1. Elsa compared Earth to a glass building that traps heat inside.
2. Sunny learned about illnesses that can spread or affect the body.
3. Elsa read about a yellow element found in polluted air that can cause acid rain.
5. Jinee talked about difficult problems that need effort and solutions.
6. Ian studied a black rock used to make energy.
7. Jinee explained how machines and inventions help humans solve problems faster.
10. Ian discussed how people born around the same time share similar experiences and responsibilities.
11. Sunny talked about using resources in a way that helps people now but also protects the future.
14. Sera noticed smoke and gases coming out of cars and factories and rising into the sky.
15. Sera learned that governments make rules to guide people’s actions and decisions.
16. Yuna learned that some illnesses affect breathing and the lungs.