B3 - Human Affect on the Environment Flashcards Preview

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Flashcards in B3 - Human Affect on the Environment Deck (52)
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1

Give three effects of the growing population.

-More waste is produced.
-Human activity takes up more land.
-Raw materials are being used up rapidly.

2

Give three ways in which humans pollute water.

-Sewage
-Fertilisers
-Toxic chemicals from industry.

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3

Give two toxic chemicals that can pollute the land.

-Pesticides
-Herbicides

4

How can pesticides pollute the water?

When it rains, the chemicals are washed into streams.

5

What is eutrophication?

When oxygen levels in water fall so low that all aquatic animals die.

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6

Describe the process of eutrophication.

-Algae grows on top of existing algae.
-The algae on the bottom layer dies due to a lack of sunlight.
-The algae decomposes at the bottom of the lake.
-The decomposers uses the oxygen in the water when respiring.
-There isn't enough oxygen to support other aquatic life.

7

What are bioindicators?

Species which can only be found in very clean or very polluted water.

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8

How is acid rain formed?

-Sulfur dioxide and nitrogen oxides are released when fossil fuels are burned.
-The gases dissolve in rainwater making it acidic.

9

Give two biological effects of acid rain.

-The ground becomes too acidic for trees as it destroys the roots.
-Rivers become too acidic for animals.

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10

Why don't countries producing acid rain feel the effects?

Wind takes the pollution to other countries.

11

How are nitrogen oxides prevented from being released from cars?

Catalytic converters.

12

What is global dimming?

The release of particulates into the atmosphere.

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13

What are the results of global dimming?

-Sunlight is reflected.
-Less light hits the surface of the Earth.
-There could be a cooling of temperatures at the surface of the Earth.

14

What is deforestation?

The destruction of forest or woodland.

15

What are the consequences of deforestation?

-Carbon dioxide is released when the trees are burnt.
-Less carbon dioxide is absorbed from the atmosphere.
-Habitats are destroyed.

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16

How does deforestation lead to carbon dioxide being released?

-Burning the trees releases CO2.
-The dead vegetation decays which releases CO2.

17

Give a problem with a loss of biodiversity.

Sources of medicine or food could be lost.

18

How does deforestation reduce biodiversity?

The forest is often replaced by a monoculture.

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19

What two things are leading to more methane being released into the atmosphere?

-Rice fields
-Cattle

20

What is the effect of destroying peat bogs?

CO2 is released.

21

What is global warming?

An increase in the temperature of the surface of the Earth.

22

Give five effects of global warming.

-Big changes in the Earth's climate.
-A rise in sea levels.
-Reduced biodiversity.
-Changes in migration patterns.
-Changes in distribution.

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23

What changes can be seen in the weather that are caused by global warming?

-Severe and unpredictable weather.
-Extensive flooding.

24

How does global warming cause a rise in sea levels?

Ice caps and glaciers melt.

25

What is the effect of rising sea levels?

Low-land flooding.

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26

How does global warming reduce biodiversity?

Organisms become extinct because of changing environments.

27

How does global warming change distribution?

-Some animals can extend their range as conditions become more favourable.

28

What are the two main types of biofuel?

-Ethanol-based fuels.
-Biogas

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29

What two plants are used for ethanol based fuels?

-Sugarcane
-Maize

30

Give two advantages of ethanol as a fuel.

-There are no toxic gases.
-The process of production is carbon neutral.