"water purification: the process of evaporation is like distillation, lifting pure water from the land or oceans, while leaving salts behind. The water cycle acts like a gigantic (and free) water purifier. Rainwater is perfect for drinking and irrigating."
"understanding biodiversity, its benefits and how it is threatened"
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Please review the linked page for context.
If you can think of something better than this,
please add it to the database