10.1 using the Earth’s resources and sustainable development

Water + alternative methods of extracting metals

What 4 things do humans use the Earth’s resources to provide?

warmth, shelter, food, transport

What are natural resources supplemented by?

agriculture

What do natural resources provide?

food, timber, clothing, fuels

Sustainable development:

development that meets the needs of current generations without compromising the ability of future generations to meet their own needs

What should drinking water have?

Sufficiently low levels of dissolves salts and microbes

What is water that is safe to drink called?

Potable water

Potable water is —— pure water

Not

What two things do the methods used to produce potable water depend on?

Available supplies of water and local condition

What kind of water does rain provide?

Fresh water

Define fresh water

Water with low levels of dissolved substances

Where does the water that rain provides collect in?

The ground and in lakes and rivers

What are the 3 stages of producing potable water? (Using fresh water)

Choose and appropriate source of fresh water. Pass the water through filter beds. Sterilisation with either chlorine, ozone or ultraviolet light

What happens if supplies of freshwater are limited?

Desalination of sea water

What produces large amounts of waste water?

urban lifestyles and industrial processes

What water requires removal of organic matter and harmful microbes?

sewage and agricultural waste water

What water requires the removal of organic matter and harmful chemicals?

industrial waste water

What are the four stages of sewage treatment?

Screening and grit removal. Sedimentation to produce sewage sludge and effluent. Anaerobic digestion of sewage sludge. Aerobic biological treatment of effluent.

Earth’s resources of natural ores are ——

limited

Explain how phytomining words

Plants are used to absorb metal compounds from the ground. The plants are then harvested and burned to produce ash. The ash contains the metal compounds

Explain how bioleaching works

Bacteria produces leachate solutions that contain metal compounds