The Earth's Atmosphere
This page covers:
Atomosphere, greenhouse gases, climate change, atmospheric pollutants
Phase 1 - the first billion years. The volcanoes erupted and realeased gases which formed our early atmosphere. It contained mostly carbon dioxide.
Phase 2 - water vapour formed oceans which dissolved most of the carbon dioxide. .
Phase 3 - green plants and algae absorbed carbon dioxide for photosynthesis. They produced oxygen and over time more complex life (animals) could evolve.
Greenhouse gases - gases in the atmosphere which help keep the warm energy in.
Global Warming - when the Earth heats up because of the increasing levels of greenhouse gases.
Climate change - the Earth weather patterns change and remain in place for an extended period of time.
Deforestation - the clearing of forests. Can cause:
- More CO2 in the atmosphere which can lead to global warming.
- More CO2 is released from the burning of trees.
- Less biodiversity, species becoming extinct when their homes are destroyed.
Carbon footprint - a measure of the amount of carbon dioxide and other greenhouse gases is released over the full life cycle of something or doing something.
Fossil fuels - natural resources that from underground over millions of years.
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