stalactites and stalagmites are A;types of cave formations B;the opposite of cave formations C; another term for cavern walls or D; caused by cave formations

There are traits like blood type and eye color, and others like speaking english or having a scar. what are the terms used to describe these different types of traits? how are each defined?

Lava and other matierls luanced from a volcano and into the air are referenced as

Oppression against people who make less money is called