geology, n.Trivia

Talc is the softest known mineral

Volcanos are mostly a water-centric phenomenon --- 90% of all volcanic activity occurs in the ocean

There are microscopic living things in solid rock up to 7 km deep, called Endoliths. So little energy is available they undergo cell division once every 100 years, and some may only divide once every 10,000 years.

Earth is the only known planet with plate tectonics