Across
- 3. When water flows over land because it can’t be absorbed.
- 5. Pollution from chemicals and human waste harms this water source.
- 6. Smallest unit of an element.
- 8. Substance made of two or more elements.
- 9. Earth’s water system including rivers and oceans.
- 12. Energy required to initiate a chemical reaction.
- 14. Sum of all chemical processes in the body.
- 18. layer of gases surrounding Earth.
- 20. Pure substance made of one kind of atom.
- 22. Process by which substances are changed into different substances.
- 23. Energy of motion.
- 24. Substance formed as a result of a chemical reaction.
- 25. Breaking down of rocks and minerals on Earth’s surface.
- 26. Scientific study of energy and its transformations.
- 28. Field focusing on chemical processes in nature.
- 29. Study of atmospheric phenomena and weather.
- 30. Study of Earth’s physical structure and substance.
Down
- 1. Increase in this causes more strain on natural resources.
- 2. Metabolic process where cells use oxygen and release carbon dioxide
- 4. Metabolic process where cells use oxygen and release carbon dioxide.
- 6. Type of biochemical reaction that builds complex molecules.
- 7. Energy stored due to position or arrangement.
- 10. Study of relationships between organisms and environment.
- 11. Place where life exists.
- 13. Type of energy carried by light or electromagnetic waves.
- 15. Molecule that speeds up chemical reactions in living organisms
- 16. Washing away of soluble materials by water.
- 17. Anything that has mass and occupies space.
- 19. Ability to do work.
- 21. Outer solid part of the Earth.
- 27. Cycle involving an essential element found in proteins and needed by plants for growth.