How to make a Stalagmite and a Stalactite
A stalagmite is a type of rock formation that rises from the floor of a cave due to the accumulation of material deposited on the floor from ceiling drippings. Stalagmites may be composed of amberat, lava, minerals, mud, peat, pitch, sand, and sinter.
The corresponding formation hanging down from the ceiling of a cave is a stalactite. Mnemonics have been developed for which word refers to which type of formation; one is that stalactite has a C for “ceiling”, and stalagmite has a G for “ground”.
Now I’ll show you how to make a stalactite and a stalagmite with some easy-to-find supplies.
Things you’ll need: two cups, alum, shoe laces (make sure that they’re made from cloth), two rocks, a spoon, and newspaper.
- Pour warm water into the cup in an equal amount.
- Put alum into the cups and stir until it’s dissolved.
- Tie a knot in the middle of the shoe laces and tie the stones on each end.
- Place the cups with alum onto the newspaper.
- Put the stone into one cup each as shown in the picture.
- Wait one week.