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Science » Earth Sciences » Environment

High School Environmental Center
is a portal to environmental resources. It organizes sites by topics: air pollution, climate change, global warming; conservation of energy, soil, and water; coral reefs, forests, watersheds, and other ecosystems; drinking water, waste water, ground water; asthma, lead, pesticides, sun protection, and other health issues; waste and recycling; and local data and maps. (Environmental Protection Agency)

   Go to this website
Interesting Fact:
Acid rain is measured using a scale called "pH." The lower a substance's pH, the more acidic it is. Pure water has a pH of 7.0. Normal rain is slightly acidic because carbon dioxide dissolves into it, so it has a pH of about 5.5. As of the year 2000, the most acidic rain falling in the US has a pH of about 4.3.
An ecosystem is defined as a place having unique physical features, encompassing air, water, and land, and habitats supporting plant and animal life.

Ecosystems

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