The water cycle - SB9

Question 1

what type of compounds do organisms need from their environment to stay alive?

Answer 1

nitrogen and carbon

Question 2

Why must carbon + nitrogen compounds be recyled?

Answer 2

there are limited amounts on Earth - they are needed to support life

Question 3

what is step 1 of the water cycle

Answer 3

water evapourates from oceans, lakes and rivers to form water vapour

Question 4

what is step 2 of the water cycle?

Answer 4

as air rises it cools so water vapour condenses to form clouds

Question 5

what is step 3 of the water cycle?

Answer 5

water droplets get too large and heavy - they fall as rain or snow

Question 6

what is step 4 of the water cycle?

Answer 6

rivers flow into lakes and eventually the water returns to the ocean

Question 7

what percent of the body is water mass?

Answer 7

60%

Question 8

what doe spotable mean?

Answer 8

safe for drinking

Question 9

what are sources of fresh water in the environment?

Answer 9

rivers, lakes + groundwater

Question 10

how is potable water made?

Answer 10

water must be treated with chemicals and flitered to remove dirt, pathogens and toxic substances

Question 11

how is water obtained in places where there is drought?

Answer 11

collected from the air or extracted from sea water

Question 12

what is desalination?

Answer 12

obtaining fresh water from the sea / salty water

Question 13

what method can be used do desalinate?

Answer 13

distillation

Question 14

what is distilation?

Answer 14

where water is evapourated and condensed and then colleced

Question 15

how does a solar still work to provide distilled water?

Answer 15

dirty water is placed inside via tube, water is left in sun to evapourated, the water then condenses under the plastic cover and collects at the bottom of the slope