Dear MEL School’s Topic Readers,
Earth was a frozen
snowball when animals first evolved.
Guessing what
happened in pre-history days is a difficult task, especially the one that
happened millions of years ago when there were no modern animals or creatures
on the ground or in the water.
But some
geologists have figured out what the earth was like hundred millions of years
ago. A snowball. Our planet was nearly entirely covered with ice around 715
million years ago and the average temperature even around the equator was
estimated to be around -20 degrees Celsius, like Antarctica today. And this
brutally freezing condition remained for the next 120 million years.
More surprisingly,
some scientists believe that this icy period triggered the evolution of modern
multi-cell creatures.
Enjoy reading and
learning what the earth was like in those ice periods.
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