GCSE Earth's resources

what is potable water

• pure water

• fresh water

• water

• water that is safe to drink

ways to sterilise water

• add chlorine

• add fluoride

• treat with UV

• treat with ozone

what does it mean to desalinate water?

• add salt to sterilise water

• remove salt

• sterilise

ways to desalinate water

• filtration

• reverse osmosis

• distillation

• evaporation

What is the life-cycle assessment?

• Evaluating the impact on the environment

• Evaluating the impact on humans

• Evaluating the impact on non-renewable resources

best definition of ores?

• rocks

• metals in rocks

• Rocks that contain enough metal to make it economically worth extracting

• Rocks that contain loads of metal

ways of extracting metals from high grade ores

• smelting

• electrolysis

• bioleaching

• phytomining

ways of extracting low grade ores

• smelting

• electrolysis

• bioleaching

• phytomining

ways of purifying a metal

• electrolysis

• displacement

• smelting

• oxidation

Using plants to absorb metals from the ground. The plants are then burnt and the ash contains a high percentage of the metal.

• electrolysis

• smelting

• bioleaching

• phytomining