Across
- 3. The upper layer, or story, in a forest that is formed by the tops of trees.
- 4. A moving mass of frozen freshwater.
- 6. The process by which the traits of a population of organisms change over many generations.
- 8. One of the alternative forms of the gene for a genetic characteristic.
- 11. The process by which water vapor changes into liquid water; the liquid water that collects when water vapor condenses.
- 12. Describes matter that does not consist of molecules in which two or more carbon atoms are bonded to each other and to hydrogen atoms.
- 14. The scientific study of plants.
- 16. The cultivation of plants and animals for human use.
- 18. A shaking of the ground produced by sudden movement at a fault.
- 19. The movement of individuals out of the population in which they have been living.
Down
- 1. Describes the variety of life on Earth. Biodiversity is the wide variety of ecosystems and living organisms.
- 2. The process by which some organisms use light energy to convert carbon dioxide (CO2) and water (H2O) into organic matter and oxygen gas (O2).
- 5. The imaginary line drawn through points at equal distances from the north and south poles, dividing Earth into two halves (the northern and southern hemispheres).
- 7. A diagram that shows the feeding relationships among organisms in an ecosystem.
- 9. No longer existing.
- 10. The weather conditions, including temperature, rain, and wind, that are typical of a particular place.
- 11. The outermost layer of the geosphere. The crust can be between 5 and 70 kilometers thick.
- 13. An underground supply of water that is contained in a layer of permeable rock
- 15. The process by which nitrates in the soil are converted back into atmospheric nitrogen gas.
- 17. Small marine cnidarians that live in large colonies and form reefs of exoskeletons.