c10a-

Question 1

MMPUD

Answer 1

materials
manufacturing
packaging
use
disposal

Question 2

What do life cycle assessments do?

Answer 2

assess the environmental impact of something over its whole life

Question 3

How do you get potable water?

Answer 3

find a source of fresh water
filtering it to remove solids
sterilizing it to kill bacteria

Question 4

what is potable water

Answer 4

water that is safe to drink

Question 5

sewage treatment steps

Answer 5

screening and grit removal of large particles
sedimentation which produces sewage sludge and effluent (liquid which remains on top)
the sewage luge is digested anaerobically by specific bacteria
the effluent is treated with aerobic bacteria

Question 6

What is phytomining? (3)

Answer 6

uses plants to absorb metal compounds
plants are harvested then burnt to produce ash that contains metal compounds
compounds can then be extracted by electrolysis or displaced using scrap iron

Question 7

What is bioleaching? (2)

Answer 7

uses bacteria to produce solutions containing metal compounds
compounds can be extracted using electrolysis or displaced using scrap iron