What Made This Huge Hole Under Greenland?

What did geologists discover under the Hiawatha Glacier in Greenland?

• A large underground river system

• A giant crater

• An ancient civilization's ruins

• A massive deposit of rare minerals

What was the Younger Dryas event?

• A period of significant global warming

• A time when the planet experienced a noticeable cooling, especially in North America and Europe

• A series of volcanic eruptions that warmed the Earth

• A period of rapid sea-level rise

What are Planar Deformation Features (PDFs) in quartz?

• A type of digital file format

• Lines scored across the crystal surface caused by intense pressure waves

• Natural growth patterns in quartz crystals

• Evidence of volcanic activity

Why was the Hiawatha Crater ultimately ruled out as the cause of the Younger Dryas event?

• It was too small to cause such a widespread climate change.

• It was formed by a volcanic eruption, not an asteroid impact.

• The quartz found in the crater was much older than the Younger Dryas event.

• Its location was not consistent with the areas affected by the Younger Dryas.