Cycles

Question 1

what is the carbon cycle

Answer 1

shows how carbon passes between the environment and living organisms

Question 2

DRAW CARBON CYCLE

Question 3

what is the role of decomposers in the carbon cycle

Answer 3

dead animals and plants are eaten by decomposers releasing CO2 into the air

Question 4

how are fossil fuels part of the carbon cycle

Answer 4

dead organisms that are not decomposed from fossil fuels that are combusted releasing CO2

Question 5

what does the water cycle show

Answer 5

how water moves between different parts of our planet

Question 6

show the steps of the water cycle

Answer 6

seawater evaporates
condenses to form clouds
precipitation (rain or snow) returns the water to the earth
surface runoff directs water to rivers or lakes
which takes the water back to the sea

Question 7

what is potable water

Answer 7

water that is safe and fit to drink

Question 8

what is desalination

Answer 8

producing potable water from salty water using distillation

Question 9

what are nitrates needed for

Answer 9

proteins and DNA

Question 10

what does the nitrogen cycle show

Answer 10

how nitrogen moves between living organisms

Question 11

what are the 3 types of bacteria used in the nitrogen cycle

Answer 11

nitrogen-fixing bacteria
nitrifying bacteria
denitrification bacteria

Question 12

what are nitrogen-fixing bacteria

Answer 12

takes nitrogen gas from the air and converts it into nitrates

Question 13

what are nitrifying bacteria

Answer 13

takes ammonium ions and converts them to nitrates

Question 14

what is denitrifying bacteria

Answer 14

converts nitrates in the soil back to nitrogen gas

Question 15

how do ammonium ions get into the soil

Answer 15

feat excretion of animals that are decomposed

Question 16

what is assimilation

Answer 16

when plants absorb nutrients

Question 17

what is crop rotation and how does it work

Answer 17

growing different crops each year on a rotation basis to improve soil fertility as different crops remove different nutrients from the soil and plants such as clover have nitrogen-fixing bacteria in their roots that can be ploughed back into the soil to add nitrates