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Summary Geography 1.2 Revision
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Summary of Topic 1 Spec Point 2 Geography
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1.2 FLASHCARD- 100 MILLION YEARS AGO – AT THE TIME OF THE DINOSAURS’ CONDITIONS WERE MUCH HOTTER THAN
THEY ARE TODAY. THERE HAVE ALSO BEEN MANY COLD PHASES CALLED ICE AGES.
- OUR LAST MAJOR COLD PERIOD THE PLEISTOCENE STARTED 2.6 MILLION YEARS AGO AND ENDED JUST
10,000 YEARS AGO. SINCE THEN, CONDITIONS HAVE BEEN WARMER.
ERUPTION THEORY ASTERIOD COLLISION
- BIG VOLCANO ERUPTIONS CAN - LARGE ASTEROID COLLISIONS
CHANGE CLIMATE. VOLCANIC COULD LEAD TO SHORT PERIODS OF
ERUPTIONS PRODUCE ASH AND COOLING BECAUSE OF THE
SULPHUR DIOXIDE. IF A VOLCANO ENORMOUS CLOUD OF DUST THAT
RELEASES ENOUGH SULPHUR WOULD BE THROWN UP BY IMPACT
DIOXIDE IT COULD REDUCE GLOBAL BLOCKING OUT THE SUNLIGHT. THE
SUNLIGHT. THIS COULD LEAD TO EXTINCTION 65 MILLION YEARS
COUNTRIES BECOMING VERY COLD. AGO MAY HAVE BEEN CAUSED BY
AN ASTEROID.
- THE ERUPTION OF MOUNT TAMBORA
IN INDONESIA IN 1815 LED TO THE - SOME SCIENTISTS BELIEVE THAT
‘YEAR WITHOUT A SUMMER’ IN 1816. AN ASTEROID COLLISION CAUSED A
PERIOD OF GLOBAL COOLING
AROUND 12,000 YEARS AGO.
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