What are two materials present in the K-T boundary that support the idea that a 10 km-wide asteroid or comet hit the Yucatan peninsula and caused or accelerated the extinction of more than 50 percent of all living species on the Earth? Explain where these two materials came from. How long ago did this happen?

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The Answer of What are two materials present in the K-T boundary that support the idea that a 10 km-wide asteroid or comet hit the Yucatan peninsula and caused or accelerated the extinction of more than 50 percent of all living species on the Earth? Explain where these two materials came from. How long ago did this happen?

What Are Two Materials Present in the K-T Boundary That