What is the K-T boundary?
The Day The Mesozoic Died

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Science
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6th - 8th Grade
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Hard
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1.
FLASHCARD QUESTION
Front
Back
The K-T boundary is a thin layer of dark clay that marks the transition between the Cretaceous and Tertiary periods, associated with the mass extinction event that occurred around 66 million years ago.
2.
FLASHCARD QUESTION
Front
What does the K-T boundary signify?
Back
The K-T boundary signifies a major extinction event that led to the disappearance of many species, including the dinosaurs.
3.
FLASHCARD QUESTION
Front
Where can the K-T boundary be found?
Back
The K-T boundary can be found almost all around the world, indicating a global event.
4.
FLASHCARD QUESTION
Front
What is the significance of the Iridium found in the K-T boundary?
Back
The Iridium found in the K-T boundary is believed to have come from an asteroid that crashed into the Earth, contributing to the extinction event.
5.
FLASHCARD QUESTION
Front
What is the primary evidence for the asteroid impact theory?
Back
The primary evidence for the asteroid impact theory includes the presence of Iridium in the K-T boundary layer and the discovery of a large impact crater in the Yucatan Peninsula.
6.
FLASHCARD QUESTION
Front
What is the Yucatan Peninsula known for in relation to the K-T boundary?
Back
The Yucatan Peninsula is known for the discovery of the Chicxulub crater, which is linked to the asteroid impact that contributed to the K-T extinction event.
7.
FLASHCARD QUESTION
Front
What are some effects of the asteroid impact on Earth?
Back
The asteroid impact likely caused massive fires, tsunamis, and a 'nuclear winter' effect, leading to drastic climate changes.
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