Environmental Science

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.

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.