Prueba

3. / Process by which soluble minerals are removed from the topsoil into the subsoil by the action of rain water.
6. / The top layer of the soil which is rich in humus, organic mater and nutrients.
7. / Name given to a tree or plant that doesn't shed its leaves in the winter. It stays green all year.
8. / Large scale global ecosystems.
12. / Process by which an abundant accumulation of nutrients support a dense growth of algae and when algae decay and die the decomposition carried out by decomposers deplete the shallow waters of oxygen.
17. / Is the changing of water from a liquid state to gas state due to heat.
20. / Process by which salty water is turned into fresh water.
21. / The action of clearing a wide area of trees.
22. / Carnivores which eat the dead remains of animals killed by predators and may occasionally kill living animals.
23. / Process by which the concentration of a toxic substance increases in each successive link in a food chain.

1. / Organic substance made by the process of photosynthesis. Plant's food.
2. / Name given to the non-living elements of an ecosystem.
4. / Is the changing of water from a gas state into a liquid state.
5. / The total number of organisms of the same species in an ecosystem.
9. / Process by which green plants produce their own food and release oxygen.
10. / Organisms that turn organic matter into inorganic matter. They are the recyclers in an ecosystem.
11. / Excessive grazing which causes damage to grassland and eventually leads to soil erosion.
13. / A barrier constructed to hold back water and raise its level, forming a reservoir used to generate electricity or as a water supply.
14. / Term used to refer to soils in which all pore spaces are filled with water leaving no space for air.
15. / Is the downward movement of water through layers of soil and rock.
16. / Gas released by green plants as a result of photosynthesis and used by living things for respiration.
18. / Name given to the living elements of an ecosystem.
19. / Plant eating animals. They are also known as primary consumers.
24. / Natural underground water store.