Hockey: Who won the Hart Trophy in 1991?

Questions

Geology There are three types of rocks: metamorphic, sedimentary, and ?

Geology These limestone deposits rise from the floor of caves.?

Geology This is the hardest naturally occurring substance.?

Geology What name is used to describe permanently-frozen subsoil?

Hahaha This normally has 4 legs and your butt is parked in it right now.?