Question

What initial observation led to the Alvarez asteroid-impact theory? a large undersea crater off the coast of the Yucatan Peninsula in Mexico high iridium levels in a 66-million-year-old clay layer in Denmark and Italy large concentrations of shock-fractured quartz in rock layers found in Europe dinosaur remains found near a large crater formed by an asteroid impact

Answer 1

The answer is high iridium levels in a 66-million-year-old clay layer in Denmark and Italy so basically B

Step-by-step explanation:

I just did the assessment on edg let me know how you did!!!!!!

Answer 2

Answer: high iridium levels in a 66- million-year-old clay layer in Denmark and Italy

Explanation: