Massive Crater Discovered Under Greenland Ice

Scientists discovered the Hiawatha impact crater beneath Greenland's ice, using radar and maps. The crater, one of the largest on Earth, is geologically young and may have formed less than 3 million years ago. Fieldwork confirmed the impact theory, finding shocked quartz grains. The crater's discovery is crucial for understanding Earth's history and assessing future impact risks.

Why is the Hiawatha impact crater considered one of the youngest large impact craters on Earth?

What implications does the Hiawatha impact crater have for understanding Earth's history?