human influence on the environment

Question 1

name some greenhouse gases

Answer 1

water vapour
carbon dioxide
nitrous oxide
methane

Question 2

one human activity that causes an increase of carbon dioxide?

Answer 2

respiration
burning fossil fuels

Question 3

one human activity that causes an increase of methane

Answer 3

food waste

Question 4

one human activity that causes an increase of nitrous oxide

Answer 4

burning coal

Question 5

effect of greenhouse gases?

Answer 5

allows earth maintain stable temperature suitable for life, greenhouse gases in the atmosphere trap heat when reflected keeping the earth warm

Question 6

what can greenhouse gases lead to?

Answer 6

global warming
sea level raise
ice caps melt
flooding
habitat destruction
climate change

Question 7

what is sewage?

Answer 7

faeces and other organic waste

Question 8

what is an indicator species?

Answer 8

species that tend to only be present when an aquatic ecosystem is healthy

Question 9

effects of water pollution?

Answer 9

aerobics bacteria in water polluted by sewage use the dissolved oxygen in the water as they break down organic materials, the lack of oxygen will kill larger organisms like fish, sewage can also contain pathogenic bacteria which are dangerous to humans

Question 10

describe the process of eutrophication

Answer 10

1. leaching of nitrogen waste into the river
2. eutrophication, algal bloom formed on the surface
3. algal bloom is blocking the sunlight
4. death of benethic plants , due to no sunlight = no photosynthesis
5. decomposition and bacteria increase
6. fish need oxygen to respire
7. no plants= no oxygen
8. death of fishy BIODIVERSITY DECREASE

Question 11

what is deforestation?

Answer 11

permanent removal of forested area due to a change in land use or due to logging

Question 12

describe deforestation

Answer 12

decrease in trees
permanent
man-made
destruction of habitat
large scale
consequences of global warming
trees are carbon sinks

Question 13

why does deforestation increase atmospheric carbon dioxide?

Answer 13

burning dead trees
decomposition of dead trees
less photosynthesis

Question 14

why does burning dead trees increase carbon dioxide in the atmosphere?

Answer 14

combustion releases carbon dioxide
no trees= no carbon dioxide absorption

Question 15

why does decomposition of dead trees increase carbon dioxide in the atmosphere?

Answer 15

fungi and bacteria respire as they decompose= releasing carbon dioxide

Question 16

why does less photosynthesis increase carbon dioxide in the atmosphere?

Answer 16

less carbon stored as biomass=increase of carbon dioxide in the atmosphere

Question 17

negative impacts of deforestation?

Answer 17

habitat destruction
extinction of species
global warming
soil erosion
leaching of mineral ions
increase carbon dioxide emission