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Ice ages
volcanic activity
100
cold periods or Glacial episods
What is an ice age?
100
large volcanic eruptions
what type of volcanic eruptions release alot of gases and ash
200
carved away land
what did ice ages do?
200
gasses and ash
scientists believe that radiation is blocked by what?
300
100,000 years ago
How long was the last ice age?
300
months or years
the gasses and ash from volcanic eruptions release can stay up in the atmosphere for how long?
400
5
How many ice ages have there been?
400
gases and ash
what do scientists believe cool the earths surface
500
10,500 years ago
When was the last ice age?