... Compression of the earth's crust 80 million to 40 million years ago caused uplift of the Rocky Mountain chain, from what is now Mexico to Canada.
(Compression of the earth's crust; caused; uplift of the Rocky Mountain chain; T:80 million to 40 million years ago)
Compression of the earth's crust
caused
uplift of the Rocky Mountain chain T:80 million to 40 million years ago