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Flashcards in Climate change Deck (23)
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1

how has orbital theory made the Earth cooler?

due to the Earths orbit, the amount of solar radiation we receive is decreased

2

how does asteroid theory make the earth cooler?

when an asteroid hits the earth, the large impact creates ash and dust which then rises to block out the sunlight

3

how does sunspot theory make the earth warmer?

when the sunspots appear, it means the earth is giving out more solar radiation than usual, therefore warming the earth

4

how does volcanic eruption theory make the earth cooler?

gases from a volcanic eruption such a sulfur nitrate and ash rise into the atmosphere and block out sunlight

5

how do ice cores tell us that climate has changed over time?

ice at the bottom of the core can be thousands of years old and contain air bubbles from around that time. The amount of carbon dioxide in the air tells us how warm the climate was around that time (the more carbon dioxide, the warmer, the less, the colder)

6

how does dendrochronolgy tell us that climate has changed over time?

A tree grows a ring each year. Tree rings grow wider in good growing conditions (warm temps) and more narrow in bad growing conditions (colder temps), therefore we can tell what harvests were like in the past.

7

how do pollen grains tell us that climate has changed over the years?

Pollen grains are blown into water and preserved in sediment on the sea bed. Each pollen grain has its own shape depending on the plant it came from. This lets scientists know what type of plants were growing in the area at the time, therefore hinting the temperatures.

8

what is the enhanced greenhouse effect?

greenhouse gases are being used more often causing them to become stronger, speeding up the process of global warming.

9

what are greenhouse gases?

gases such as carbon dioxide, methane, nitrous oxide

10

what is global warming?

the process in which the earth is gradually becoming hotter due to greenhouse gases polluting the atmosphere

11

which human action produces carbon dioxide?

burning fossil fuels and deforestation

12

which human action produces methane?

agriculture, landfills and rice farming

13

which human action produces nitrous oxide?

vehicles (especially aeroplanes) and fertilizers used in agriculture

14

what % of global warming is due to carbon dioxide usage?

89%

15

what % of global warming is due to methane usage?

7%

16

what % of global warming is due to nitrous oxide usage?

3%

17

how many more times powerful is methane than carbon dioxide when it comes to global warming?

21 times more powerful

18

how many more times powerful is nitrous oxide than carbon dioxide when it comes to global warming?

250 times more powerful

19

how does climate change effect crop yields (size of harvests)?

countries near the equator will face food shortages due to drought which could potentially lead to famine

20

how does climate change effect glaciers?

melting ice in the Arctic could potentially cause the Gulf Stream to be diverted South leading to colder temps in the Western region of Europe

21

how does climate change effect sea levels?

sea levels are rising due to ice melting meaning cities on low-lying land such as London, Tokyo and New York have a risk of being flooded in the future

22

how does climate change effect extreme weather events?

Rising sea levels cause more coastal flooding. Warmer seas mean air is rising, cooling and condensing to form storm clouds.

23

how does climate change effect Arctic sea ice?

ships can enter arctic regions more frequently and easier meaning companies can transport and trade goods cheaper. Cruise ships can explore the area meaning income can be brought through tourism.