3b.1 - Human Impact on the Environment Flashcards

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1
Q

Why has the population increased? (2)

A
  • Medicine

- Farming

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2
Q

How has population growth impacted on water? (2)

A
  • Sewage and toxic chemicals from industry pollute lakes

- Fertilisers can be washed into water

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3
Q

How has population growth impacted on the land? (2)

A
  • Toxic chemicals used for farming

- Burying of nuclear and household waste underground

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4
Q

How has population growth impacted on the air? (2)

A
  • Smoke and gases released into the atmosphere
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5
Q

What human activities limit the amount of land and resources for other animals and plants? (4)

A
  • Building
  • Farming
  • Dumping waste
  • Quarrying for metal ores
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6
Q

Where can CO2 be sequestered?

A
  • Oceans, lakes and ponds
  • Green plants
  • Peat bogs
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7
Q

What does ‘sequestered’ mean?

A

Locked up

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8
Q

Describe what the ozone layer does (3)

A
  • Temperature is a balance between the heat from the sun and the heat radiating into space
  • Acts as an insulating layer
  • Absorbs heat radiating from the earth and re-radiates it in all directions
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9
Q

What are greenhouse gases?

A

The gases in the atmosphere which help keep the heat in

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10
Q

What are the two main greenhouse gases?

A

Methane and CO2

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11
Q

Why is global warming happening?

A

Increasing levels of greenhouse gases

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12
Q

Why does deforestation happen? (3)

A
  • Provide timber to use as a building materials
  • Clear more land for food and bio-diesel
  • Produce paper
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13
Q

What does deforestation lead to?

A
  • More methane
  • More CO2
  • Less CO2 taken in
  • Less biodiversity
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14
Q

What is biodiversity?

A

Variety of different species

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15
Q

What are bogs?

A

Areas of land that are acidic and waterlogged

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16
Q

What is peat?

A

Plants that live in bogs that don’t fully decay because there’s not enough oxygen

17
Q

What is happening to peat bogs?

A
  • Drained so that area can be used for farming or fuel
18
Q

Why should peat bogs not be drained?

A

Then they decay and release CO2

19
Q

How can people reduce the number of peat bogs destroyed?

A
  • Buy peat-free compost
20
Q

What are the consequences of global warming? (4)

A
  • Rising sea levels
  • Changes weather patterns
  • Biodiversity
  • Changes in migration
21
Q

How does the sea level rise? (2)

A
  • Sea warmer so expands

- Melting of ice caps

22
Q

How do scientists collect evidence for global warming?

A
  • Satellites to monitor snow and ice and measure temperature of sea surface
  • Temperature and speed of ocean currents
  • Atmospheric temperatures