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What evidence identified the Yucatan as the site of the crater?

Evidence for the impact origin of the crater includes shocked quartz, a gravity anomaly, and tektites in surrounding areas. In 2016, a scientific drilling project drilled deep into the peak ring of the impact crater, hundreds of meters below the current sea floor, to obtain rock core samples from the impact itself.

What is the evidence for the asteroid impact theory?

Kelly and Frank Dachille analyzed global geological evidence suggesting that one or more giant asteroids impacted the Earth, causing an angular shift in its axis, global floods, fire, atmospheric occlusion, and the extinction of the dinosaurs.

What evidence is there that a meteorite impact occurred at the Cretaceous Tertiary boundary?

A meteorite big enough to be called a small asteroid hit Earth precisely at the time of the K-T extinction. The evidence for the impact was first discovered by Walter Alvarez and colleagues. They found that rocks laid down precisely at the K-T boundary contain extraordinary amounts of the metal iridium (Figure 18.1).

What are the factors that affect the size of an impact crater?

The size and shape of a crater depend on several factors:

  • the mass of the impacting object;
  • the density of the impacting object;
  • the velocity of the impacting object; and.
  • the geology (type of rock) of the surface the object strikes.

Why is the KT Boundary important?

The K-T boundary separates the age of reptiles and the age of mammals, which was first recognized over one hundred years ago by geologists who realized that there was a dramatic change in the types of fossils deposited on either side of this boundary.

What are the 5 major extinctions?

Top Five Extinctions

  • Ordovician-silurian Extinction: 440 million years ago.
  • Devonian Extinction: 365 million years ago.
  • Permian-triassic Extinction: 250 million years ago.
  • Triassic-jurassic Extinction: 210 million years ago.
  • Cretaceous-tertiary Extinction: 65 Million Years Ago.

How did the KT Boundary form?

Researchers now think that the asteroid strike that created the K-T boundary was probably the Chicxulub Crater. This is a massive impact crater buried under Chicxulub on the coast of Yucatan, Mexico. The crater measures 180 kilometers across, and occurred about 65 million years ago.

How big was the KT asteroid?

The asteroid is thought to have been between 10 and 15 kilometres wide, but the velocity of its collision caused the creation of a much larger crater, 150 kilometres in diameter – the second-largest crater on the planet.

How long does it take to go to Mars?

Nasa’s Mars Perseverance rover launched on July 30, 2020, from the Cape Canaveral Air Force Station, Florida in the US. It travelled for around seven months before landing safely on the surface of the red planet on February 18, 2021 just before 9pm (GMT).