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Science
Environmental Science
AS
Glacial/Interglacial Periods and Volcanic Eruptions
Sea Level- Glacial/Interglacial Periods
more glaciers = lower sea level
water that makes snow and eventually glaciers come from oceans
example:
7.6 million miles of glaciers exist today → 230 foot rise in sea level if all of it melted
Ice Age was 20,000 years ago
3 times the amount of ice that is present today
sea level is 460 feet lower than it is today
Physical Earth-Based Factors: Volcanic Eruption
flood basalts = largest eruptions on Earth
erupts huge amount of lava over a “brief” )geologically speaking) time period
bury large areas in lava
gases emitted into the atmosphere
SO2 causes global cooling
CO2 causes global warming (longer term)
ocean also absorb a lot of gases
change acidity and oxygen concentration
example:
Siberian traps = 800,000 miles of lava covering 1.5 million miles in Siberia
coincides with the Permo-Triassic extinction (a major mass extinction)
Extraterrestrial-Based Factors
Earth is constantly being bombarded with asteroids and (to a lesser extent) comets
a meteoroid with a diameter of 6 miles could cause wildfires, acid rain, tsunami, and a dust cloud that could block out the sun for weeks to months
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The History of Ice Cream
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