multiple select question select all that apply what evidence indicates that an asteroid colliding with earth…

multiple select question select all that apply what evidence indicates that an asteroid colliding with earth near the yucatán peninsula caused a mass extinction at the end of the cretaceous period? clay - filled impact crater high degree of photosynthetic activity as indicated by isotopic dating uplifted ridges in several continents huge semicircle of sinkholes layer of iridium in cretaceous rock

multiple select question select all that apply what evidence indicates that an asteroid colliding with earth near the yucatán peninsula caused a mass extinction at the end of the cretaceous period? clay - filled impact crater high degree of photosynthetic activity as indicated by isotopic dating uplifted ridges in several continents huge semicircle of sinkholes layer of iridium in cretaceous rock

Answer

Brief Explanations:

  • A layer of iridium in Cretaceous rock is evidence as iridium is rare on Earth's surface but common in asteroids.
  • A clay - filled impact crater near the Yucatán peninsula is a direct sign of a large - scale asteroid impact. High degree of photosynthetic activity reduction as indicated by isotopic dating is a consequence of the dust and debris from an asteroid impact blocking sunlight. Uplifted ridges in several continents could be related to the seismic and tectonic effects of a major impact. A huge semi - circle of sinkholes may also be related to the impact event.

Answer:

  • layer of iridium in Cretaceous rock
  • huge semi - circle of sinkholes
  • uplifted ridges in several continents
  • high degree of photosynthetic activity as indicated by isotopic dating
  • clay - filled impact crater