- •Волгоградского государственного
- •Unit one text
- •8 Unit One
- •II. Vocabulary
- •III. Prepositions
- •V. Values discussion
- •VI. Role-play
- •VIII. Rendering in english
- •I. Reading comprehension
- •II. Vocabulary
- •19 Environmental Science: Two World Views
- •III. Prepositions
- •V. Values discussion
- •VI. Role-play
- •VIII. Rendering in english
- •Unit three text
- •Exercises
- •I. Reading comprehension
- •II. Vocabulary
- •III. Prepositions
- •V. Values discussion
- •VI. Role-play
- •VIII. Rendering in english
- •39 Unit four text
- •Useful words and expressions
- •Exercises
- •I. Reading comprehension
- •II. Vocabulary
- •V. Values discussion
- •VI. Role-play
- •VII. For discussion and composition
- •VIII. Rendering in english
- •Unit five text
- •Exercises
- •I. Reading comprehension
- •II. Vocabulary
- •III. Prepositions
- •V. Values discussion
- •VI. Role-play
- •VIII. Rendering in english
- •I. Reading comprehension
- •II. Vocabulary
- •III. Prepositions
- •VI. Role-play
- •VIII. Rendering in english
- •85 Unit seven text
- •Useful words and expressions
- •I. Reading comprehension
- •II. Vocabulary
- •V. Values discussion
- •Exercises
- •I. Reading comprehension
- •II. Vocabulary
- •III. Prepositions
- •IV. Definite/indefinite articles
- •V. Values discussion
- •VI. Role-play
- •VIII. Rendering in english
- •Word list
III. Prepositions
Fill in the correct preposition for each blank space.
1. Herein is the first basic principle ecosystem sustainability:
sustainability, ecosystems dispose wastes and replen ish nutrients recycling all elements.
2. This principle is harmony the Law Conser vation Matter.
•>• Wfe can see this even more clearly focusing the path ways three key elements: carbon, phosphorus, and nitrogen.
4- It is convenient to start the carbon cycle the "reservoir"
carbon dioxide molecules present the air and dis solved water.
60
Unit Five
Ecosystems: How They Work
61
5. Through food chains, the carbon atoms then move and be come part the tissues all the other organisms
the ecosystem.
6. However, it is unlikely that a particular carbon atom will be passed
many organisms any one cycle because each
step there is a considerable chance that the consumer will break the organic molecule cell respiration.
As this occurs, the carbon atoms are released back the environment molecules carbon dioxide, thus completing one cycle, but course ready to start another.
Phosphate dissolves water but does not enter air.
The phosphate may then be reabsorbed plants to start another cycle.
10. No matter carbon dioxide is released, it will mix and
maintain the concentration carbon dioxide the air.
A very serious case humans interfering the phosphorus cycle is seen the cutting tropical rainforests.
This type of ecosystem is supported a virtually 100 percent
efficient recycling nutrients.
13. Meanwhile, phosphorus is replaced croplands min ing phosphate rock a process that will ultimately result
depletion.
14. Fixed organic nitrogen is passed the legumes other
organisms the ecosystem food chains.
IV. DEFINITE/INDEFINITE ARTICLES
Use a/an or the where needed. If no article is needed, write an A" in the blank space.
However, it is unlikely that particular carbon atom
will be passed through many organisms on any one cy cle because at each step there is considerable chance that .
consumer will break down organic molecule in cell res piration. As this occurs, carbon atoms are released back to .
environment in molecules of carbon dioxide, thus com pleting one cycle, but of course ready to start another. Like wise, burning organic material returns carbon atoms
locked up in material to air in carbon dioxide
molecules. No two successive cycles of particular carbon atom
are likely to be same. Nor are two cycles likely to be
within same ecosystem because in atmosphere
wind will carry them around globe.