Welcome
back my fellow learners, today we are going to find out what exactly
happened to those Goliath all those decades ago
For over
150 million years, those Goliath known as dinosaurs ruled the Earth.
They were so good at it, that other animal species, including
mammals, had very little chance of taking anything but a secondary
role on.
Then,
suddenly nearly 65 million years ago, they all disappeared from the
face of the earth completely. Did they have a quick and painless
end?, or did this happen gradually?
With
their search for answers to what wiped dinosaurs out, scientists
looked beyond fossils. Geological evidence has some clues and
contributed to several hypotheses of how dinosaurs become extinct.
This
mystery is not a simple whodunit. The same evidence can sometimes be
subject to several interpretations. To date there is no piece of
evidence which can support only one hypothesis, above all others.
Evidence
Scientific
evidence are the building blocks of all hypotheses. To begin with,
the same evidence can support multiple hypotheses. As more evidence
comes to light, some hypotheses are then substantiated, whilst others
are disproved, and eventually new ones are created.
It is
agreed that an object which is 10 kilometres across, hit just off the
coast of Yucatan peninsula over 65 million years ago.
According
to some that maintain dinosaurs became extinction over night, the
impact must have spelled a cataclysmic result.
For
months, scientists state, that thick clouds of dust closed off the
sun's rays, darkening and chilling the planet to dangerous levels for
many plant life and, in turn, a lot of animals. When the dust finally
lifted, greenhouse gases that were created by this impact made
temperatures sky-rocket rising above pre-impact levels.
In only
a few years, these frigid and sweltering extremes were the cause of
the extinction of not only dinosaurs, but up to 70% of plants and
animal life that were around at the time.
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