How do we know the last meteor hit the earth 65 million years ago and not 1 million years ago?
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answers:
Ronald 7 say: Meteors fall to Earth all the time
They are Space Debris left over from the formation of the Solar System's formation
They could tell us a lot and do
The Big ones really do make an Impact !!
The Barringer Crater 37 miles East of Flagstaff and 18 miles of Winslow
50, 000 years ago is clearly visible and 0.737 miles wide in Airizona
Impactor was reckoned to be at least 160 feet across
In 2012 one exploded over Chebalinsk in Russia blowing in doors and breaking windows
Don't forget the one in Siberia 1908 that flattened Square miles of forest
A recently as last Saturday the was a major explosion from one at 32, 000 feet over the Bering Straight
It was only recorded by the Military and took a while for the news to get through
We see Shooting Stars all the time as tons of the stuff falls to Earth each year
The Most Famous one of the lot was the Chixulub Impact 65 Million years ago
It was 7 miles across, ( The Size of Los Angeles ) and left a fossilised crater 250 miles across on the Yucatan Peninsula
It created a mass Extinction Event
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nineteenthly say: The Chicxulub Impactor, which may not have been an asteroid but a cometary nucleus, was by no means the last massive object to hit this planet. It was just the most significant one. There was a large one as recently as 1908, which hit Siberia.
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Eric say: These ridiculous dates and theories change every so often. Dinosaurs never existed.
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Athena say: We don't.
The meteor that killed the dinosaurs was 65 million years ago.
There have been a low of collisions sense.
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Jeffrey K say: Lots of meteors hit earth during the last million years. The one that killed the dinosaurs certainly wasn't the most recent one.
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neb say: Iridium anomalies in strata that dates to 65,000,000 years ago. Meteors/asteroids have higher iridium content than normally found on earth so the iridium deposited in the strata around the world is the smoking gun for a massive strike 65,000,000 years ago.
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quantumclaustrophobe say: We get hit every day. In 2013, one exploded over Chelyabinsk, Russia, that broke windows, knocked doors off hinges, and injured a few thousand people. 50-60,000 years ago, one punched a hole in the desert of Arizona:
https://www.fossweb.com/delegate/ssi-fos...
There are about 80 to 85 large circular features on Earth that are thought to be past meteor strikes, their ages ranging from a few hundred years ago to several million.
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Nyx say: For one thing meteors hit the Earth by the ton 24/7/365.
For that particular impact, radiometric dating is used, along with with geologic supposition (where the layer on top is younger that the layer underneath).
https://www.berkeley.edu/news/media/rele...
https://nsf.gov/news/news_summ.jsp?cntn_...
And there are several places around the globe where the boundary lay is plainly visible.
/uploads/allimg/c190322/15532A5b0UF-23Y0.jpg
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billrussell42 say: meteors hit earth 5-10 every year. There was a major hit in July of 2018.
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say: Intelligence software can usually tell when.
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Zardoz say: The Earth has never been hit by a meteor. Meteors live out their entire lives in the mesosphere.
Meteors are streaks of light caused by a meteoroid incandescing as it intersects the Earth's upper atmosphere.
A honk is not a horn.
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CarolOklaNola say: The impact pulverized the meteorite and turned the impacted rocks into lava. Any radioactive isotopes started the radioactive decay "clock " to zero. Potassium 40 has has a half life of 1.251 x 10^9/years. Potassium 40 decays onto argon 40 and calcium 40.
The ash layer from the pulverized meteorite has a rare isotope of iridium that was deposited almost around the world right at 66 to 65 million years ago.
That's how we know The Chicxulub impact was was NOT 1 million years the crater is half underwater and is a cenote.
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Bill-M say: The last meteor hit the Earth 30 Seconds ago.
The ASTEROID the killed the Dino's hit the Earth Millions of years ago. How do we know? Carbon Dating.
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Climate Realist say: Geological dating, including igneous intrusions through the KT boundary.
That was not the last meteor. That was the last meteor that was several kilometers across, but Earth has been hit with millions of much smaller meteors since then, including the one that made the meteor crater in Arizona and the one that caused a massive explosion over Siberia in 1908. Sodom and Gomorrah were probably destroyed by a meteor similar to the 1908 Siberia meteor.
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