Once geologists narrowed their focus to the Western Hemisphere, what series of investigations led to the discovery of the Chicxulub crater?

Scientists examined the ages and sizes of impact craters in North and South America. They investigated the Manson crater in Iowa. Although it was the right age, it was too small to be the location where an asteroid 10 km in diameter would have hit Earth. Since two-thirds of Earth is covered by water, scientists narrowed their focus to undersea impact sites near North and South America. This is when they discovered the Chicxulub crater off the coast of the Yucatan Peninsula in Mexico. It was both the right age and size to match the impact site the Alvarez team was searching for.

Explanation:

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