2-4 Word Scramble
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| Term | Definition |
| smog | thick haze of smoke and chemicals |
| acid rain | chemicals from air pollution that combine with precipitation |
| greenhouse effect | buildup of certain gases in the Earth's atmosphere that, like a greenhouse, retain the sun's warmth |
| crop rotation | changing what crops farmers plant in a field from year to year |
| deforestation | cutting down of forests without replanting new trees |
| conservation | careful use of resources to avoid wasting them |
| irrigation | process of collecting water and distributing it to crops |
| pesticide | powerful chemicals that kill crop-destroying insects |
| ecosystem | place shared by plants and animals that depend on one another for survival |
| biodiversity | variety of plants and animals living on the planet |
| layer | a thickness or fold |
| technique | a method of accomplishing something |
Created by:
akennon
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