Question

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

Explanation:

• 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