GCSE AQA Using resources

What do human’s use the Earth’s resources for?

• Warmth

• Shelter

• Food

• Transport

• All of the above

What should drinking water have low levels of?

• Dissolved salts and microbes

• Carbon dioxide

• Oxygen

What is potable water?

• Dirty water

• Expensive water

• Water that is safe to drink

Is potable water pure?

• No

• Yes

What two things can we use as sterilising agents?

• Chlorine

• Fluorine

• UV light

• Bleach

What is desalination?

• Adding salt from water

• Removing salt from water

River water is filtered then sterilised to make drinking water. Why is it filtered?

• kills bacteria
• removes solids
• removes dissolved salts
• adds chlorine
• removes germs

River water is filtered then sterilised to make drinking water. Why is it sterilised?

• kills bacteria
• removes solids
• removes dissolved salts
• adds chlorine
• removes germs

Why is distilling sea water to make drinking water expensive?

• uses a lot of chemicals
• it's slow
• needs expensive equipment
• takes lots of time
• takes a lot of energy

Give a difference between pure and potable water?

• Pure water is suitable for drinking
• Potable water contains dissolves solids & chlorine
• Pure water contains dissolved solids & chlorine
• Potable water is not safe to drink