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Environmental Science

Free Environmental Science study guide: 7 units with summaries, key ideas, flashcards and 69 practice questions with step-by-step solutions.

Lines up with: AP Environmental Science.

Units

1. UNIT 01

   Ecosystems

   Ecosystems move energy from the sun through food webs while recycling matter through biogeochemical cycles.
2. UNIT 02

   Biodiversity and populations

   Biodiversity keeps ecosystems resilient. Population growth depends on births, deaths and the limits of the environment.
3. UNIT 03

   Earth systems and resources

   Earth's physical systems, from tectonic plates to soil and the atmosphere, set the stage for life and human resource use.
4. UNIT 04

   Land and water use

   How people farm, build and harvest resources changes land and water. Sustainable practices reduce the damage.
5. UNIT 05

   Energy resources

   Societies run on energy. Fossil fuels are cheap but polluting; renewables are cleaner but have their own trade-offs.
6. UNIT 06

   Pollution

   Pollution harms air, water and land. Some pollutants build up in food chains, and some come from sources that are hard to pin down.
7. UNIT 07

   Global change

   Human activities are changing Earth's climate and ecosystems. Understanding the causes points to solutions.