Crystals in Caves

The video explains how caves are formed over thousands of years by rainwater that absorbs carbon dioxide, creating carbonic acid. This acid dissolves limestone, forming caves. Water in these caves dissolves calcium, leading to crystal formation through nucleation. Stalagmites and stalactites are common formations in these caves, which may remain undiscovered for thousands of years.

What role does carbonic acid play in the formation of caves?

• It dissolves the limestone rock.

• It forms stalagmites and stalactites.

• It evaporates the water in caves.

• It strengthens the limestone rock.

What happens when the solution in a cave becomes saturated with calcium?

• Ions start to collide and stick together.

• The solution evaporates completely.

• The cave fills with water.

• The cave stops growing.

What is nucleation in the context of crystal formation?

• The process of water evaporating from a solution.

• The arrangement of ions into a repetitive pattern.

• The dissolution of limestone by carbonic acid.

• The saturation of a solution with calcium.

Under what conditions do calcite crystals continue to grow in caves?

• Unstable temperatures and humidities.

• High temperatures and low humidity.

• Stable temperatures and humidities.

• Low temperatures and high humidity.

What are stalagmites and stalactites?

• Types of limestone rock.

• Crystal formations found in caves.

• Processes of cave formation.

• Methods of measuring cave age.