Permafrost occurs in the tundra. what is permafrost?

By the triangle inequality theorem, if two sides of a triangle have lengths of 3 and 7, what are all the possible lengths of the third side? a) 3 < x < 8 b) 3 < x < 7 c) 4 < x < 10 d) 5 < x < 7

How does central place theory explain patterns in the size and distribution of cities?

Under which condition below would u expect a coarse-grained intrusive rock like diorite to form?