Question

what does graham hancock now think caused the cooling period 12,800 years ago?
○ ozone depletion
○ a cosmic impact
○ a change in the earths rotation
○ a volcanic eruption
question 85
1 pts
what evidence does the comet research group use to support their idea behind climate change at 12,800 year ago?
○ shocked quartz
○ all of the answers are correct
○ nanodiamonds
○ meltglass

Explanation:

First Question (What does Graham Hancock now think...):

Graham Hancock's views on the cooling period 12,800 years ago align with the cosmic impact hypothesis (related to the Younger Dryas impact theory). Ozone depletion, earth's rotation change, or single volcanic eruption are not his proposed cause here.

The Comet Research Group (supporting the cosmic impact for Younger Dryas) uses multiple lines of evidence including shocked quartz, nanodiamonds, and melt glass (all indicating high - energy impacts). So "All of the answers are correct" is appropriate.

Answer:

B. A cosmic impact

Second Question (What evidence does the Comet Research Group use...):