The term "pangaea" was first used by alfred wegener. he proposed the theory.

a. continental shelf
b. floating continent
c. hyper continent
d. continental drift

Suggest two reasons why irrigation is important for human development of the desert

If we represent the solar system on a scale that allows us to walk from the sun to pluto in a few minutes, then a) the planets are microscopic and the stars are millions of miles away. b) the planets are the size of basketballs and the nearest stars are a few miles away. c) the planets are marble size or smaller and the nearest stars are thousands of miles away.

The blue segment below is a diameter of oo. what is the length of the radius of the circle?