Answer 1:
Yes, it seems that this happened. The
following links made reference to these events.
Please read them carefully.
link 1
Fragment from this link:
"In 1980 a famous scientists named Luis Alvarez
discovered that when the dinosaurs first began to
disappear, rocks and fossils from all around the
planet had a thick layer of iridium dust. Iridium
is a metal, like iron or aluminum, and is present
in large amounts on asteroids. From this finding,
Alvarez guessed that a huge asteroid hit the earth
65 million years ago and caused the dinosaurs to
go extinct. In the 1990's, paleontologists found
the crater from this asteroid on the Yucatan
peninsula in Mexico, and found rock fragments from
this impact had been blown as far away as
Nebraska! Judging from the amount of iridium dust
and the size of the crater, Alvarez and other
scientists guessed that huge amounts of dust and
ash from the explosion were thrown into the sky
and calculated that this blanket of soot would
have blocked out the sun for many years."
link 2
Fragment from this link:
"65 million years ago a ten kilometer object hit
the earth at the Yucatan peninsula in Mexico. This
impact killed 90% of all life on the planet and
created a thin layer of debris all over the
planet. It was dark for six months and the oceans
became somewhat toxic for a while. If this
happened again today, civilization would be wiped
out -probably no one would survive".
link 3
Fragment fro this link:
"While very small meteorites hit the Earth every
day, the last big impact was 65 million years ago,
when it is believed that a comet hit the Yucatan
peninsula in Mexico. It caused enough damage to
the environment to kill all the dinosaurs and many
other kinds of animals. Such events seem to happen
surprisingly regularly throughout the history of
the Earth".
link 4
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