Vocab : Nature - Petroleum Alternatives

Target Words :
constraint          emission
contamination   extinction
deplete             reservoir
dispose of        shrink
elementally       stable

Definitions and Samples :
1. constraint n. Something that restricts thought or action
"The constraints of military life kept Eileen from seeing Private Morris more than once a month".

2. contamination n. Being made less clean by a germ or hazardous substance
"The contamination in the river came from the factory located just upstream".

3. deplete v. To greatly decrease the supply of a resource or material
"The prolonged war depleted the country’s national treasury".

4. dispose of v. To throw away; to get rid of; to kill; Usage tips Dispose of should be learned as a unit. In this meaning, dispose does not occur without of.
"She disposed of her unwanted possessions before moving".
"The tyrant cruelly disposed of all his enemies".

5. elementally adv. In terms of elements; basically
"Elementally, coal and diamonds are the same".

6. emission n. Sending out from a small space into the general environment; a substance discharged into the air; Usage tips Emission is usually followed by an of phrase.
"The Environmental Protection Agency regulates the emission of pollutants into the air".

7. extinction n. Complete disappearance; the end of existence; Usage tips Extinction implies an absolute end; an extinct thing cannot be brought back into existence.
"Human beings have caused the extinction of many other species".

8. reservoir n. A place where a liquid is collected and stored
"Cult members threatened to poison the town’s water reservoir".

9. shrink v. To become reduced in size, amount, or value
"If you dry your clothing on the “high heat” setting, they may shrink".

10. stable adj. Firm and dependable; showing little change
"He fell because the ladder wasn’t stable".