science

3. – Melted rock found on Earth’s surface.
6. rock – A rock made from layers of sediments pressed and cemented together.
7. rock – A rock formed when existing rocks change due to heat and pressure.
9. – The process plants use to make glucose using light energy, carbon dioxide, and water.
10. dioxide – A gas taken in by plants for photosynthesis.
13. respiration – The process of releasing energy from glucose without using oxygen.
15. web – A network of connected food chains in an ecosystem.
16. – The chemical process in cells that releases energy from food.
18. respiration – The process of releasing energy from glucose using oxygen.
20. – A sugar made by plants during photosynthesis and used for energy.

1. – The substances used at the start of a chemical reaction.
2. – The movement of rock particles by wind, water, or ice.
4. – The process that breaks rocks into smaller pieces by wind, water, ice, or temperature changes.
5. – Small pieces of rock, soil, or organic material that form sedimentary rocks.
8. – An organism, such as a plant, that makes its own food.
11. debt – The extra oxygen needed after exercise to break down lactic acid.
12. – The substances made at the end of a chemical reaction.
14. rock – A rock formed when melted rock cools and becomes solid.
17. – A gas needed for aerobic respiration.
19. – A substance burned to release energy for everyday activities.