1. Underground the world below us

2. How are crystals formed?
Molecules join together with other substances to form a crystal but it takes loads of time to form a crystal.

3. How are caves formed ?
Most caverns are created at or just below the water table in the zone of saturation in limestone. If the water table is stable, large openings can be created because water would contact all surfaces of the cave, dissolving the limestone at a large scale. If the water table drops, the area of active cave formation will move lower into the bedrock and the upper openings are left in the zone of aeration, only subject to dissolution from running water. Water dripping through these dry passages may deposit CaCO3 in various forms collectively referred to as speleothems.

4. What is the rarest crystal ?
It is jadeite I always thought it was diamond.

5. What is the largest underwater cave ?
The gypsum cave In Russia has also crystals inside !

6. What is my favorite crystal ?
It is amethyst I have a big slab at home.

8. The end hope you liked it !!!!!!!!!