Across
- 2. Microscopic marine algae.
- 5. 6th element on the periodic table
- 7. The total quantity or weight of organisms in a given area or volume.
- 8. The process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of glucose.
- 9. Carbon that is extracted from ores or minerals.
- 10. The process that occurs in the mitochondria of organisms to break down sugar in the presence of oxygen to release energy in the form of ATP.
Down
- 1. A natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.
- 3. Formed by hydrogen ions combining with carbonate.
- 4. The emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionisation.
- 6. The envelope of gases surrounding the earth or another planet.