human influences on the environment

Question 1

why is carbon monoxide dangerous to be produced

Answer 1

it binds irreversibly to hemoglobin which prevents it from carrying oxygen, too much exposure can cause unconsciousness and death

Question 2

what are five greenhouse gases

Answer 2

1. water vapour
2. carbon dioxide
3. nitrous oxides
4. methane
5. CFCs

Question 3

how do greenhouse gases lead to global warming

Answer 3

• greenhouse gases allow heat from the sun to enter the atmosphere
• the gases act as a blanket and trap the heat in the atmosphere

Question 4

why is sewage in rivers bad for aquatic life

Answer 4

microorganisms that decompose sewage will use up the oxygen un the water so there is not enough oxygen left for respiration for other aquatic organisms

Question 5

what is eutrophication

Answer 5

an excess of nutrients in a body of water often due to fertilizers in the water source

Question 6

why is eutrophication bad for aquatic life

Answer 6

because it causes algal bloom which decreases oxygen supplies in the water and degrades the water quality

Question 7

five negative effects of deforestation

Answer 7

1. leaching
2. less CO2 taken out of the atmosphere from photosynthesis
3. soil erosion
4. habitat disruption
5. disruption of the carbon cycle

Question 8

how does leaching lead to algal bloom

Answer 8

trees usually take up lots of nutrients. when lots of trees are cut down, these nutrients can leak out into waterways. large quantities of nutrients in waterways can cause problems like algal bloom

Question 9

what is evapotranspiration

Answer 9

the process involving trees providing lots of water to the atmosphere from the soil through evaporation and transpiration

Question 10

what effects does deforestation have on evapotranspiration

Answer 10

• less trees means there will be less evapotranspiration
• this means that less water will be returned to the atmosphere as quickly
• this causes areas to dry up