The Earth's Resources
Key Words
Natural resources - anything that comes from the earth, sea or air without human input.
Renewable resources - forms at the same rate as it is consumed.
Finite (non-renewable) resources - forms at a slower rate than it is consumed.
Sustainable living -  living in a way that makes things last for the future.
Recycling - converting waste materials into new materials.
Life cycle assessments - looks at every stage of a product's life to access the impact it would have on the environment.
Portable water - water that's been treated and is safe for humans to drink.
Filtration - wire mesh stops large twigs, gravel and other solid particles from water.
Sterilistaion - harmful bacteria or microbes are killed.
Distillation - seperation of substances in a liquid by  boiling and condensation.
Sewage - liquid and solid waste carried off in sewers and drains.
Sewage treatment - process of removing the contaminants from sewage.
Also see Using Earth's Resources, Energy Resources, Atomic Structure
