The World's Biggest Geode Is A Literal Cave

What is a geode?

• A type of volcanic rock

• A cave filled with water

• A rock with crystals inside

• A type of sedimentary rock

How did the Crystal Cave in Ohio originally form?

• Through volcanic eruptions.

• By water dissolving a mineral called anhydrite.

• Due to ancient earthquakes creating large cracks.

• From glaciers carving out the rock.

What does the size of crystals in a geode tell us about its age?

• Smaller crystals mean the geode is older.

• Larger crystals mean the geode is older.

• Crystal size is not related to the geode's age.

• The color of the crystals indicates the geode's age.

What mineral forms the pale blue crystals found in Crystal Cave?

• Quartz

• Amethyst

• Anhydrite

• Celestine