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Slide 1

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By the end of this lesson you will:
·Be able to describe changes in global temperature over
·Be able to explain reasons for changes in global
temperatures.…read more

Slide 2

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It appears that roughly every 200-250 million years in the
Earth's history there have been major periods of ice activity.…read more

Slide 3

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In the last 2 million years there have been fluctuations in
global temperature of between 5º and 6ºC which have led to
cold phases (glacials) and warm phases (interglacials).…read more

Slide 4

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Only 18,000 years ago at the time of the maximum ice advance
within the last glacial, ice covered Britain as far as the Bristol
Channel, the Midlands and Norfolk. The southern part of
Britain experienced tundra conditions (ground remains
permanently frozen apart from the top few cm which may
thaw in summer).…read more

Slide 5

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The last ice age ended approximately 10,000 years ago. The
temperature since that time has increased by 6*C.
·After the last ice age the temperature rose rapidly for the
following 2,000 years. Between 4,000 and 8,000 years ago
there were 2 warm periods interrupted by a colder spell.…read more

Slide 6

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Another warm spell
happened between the
years AD 800 and AD
1200 which was known as
the medieval warm period.…read more

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Slide 9

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Slide 10

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