physical geography
... side of the Salton Basin between 150 to 90 million years ago—mountains made up of huge granite domes, the result of molten bubbles or "plutons" that hardened beneath the earth's crust. ...
... side of the Salton Basin between 150 to 90 million years ago—mountains made up of huge granite domes, the result of molten bubbles or "plutons" that hardened beneath the earth's crust. ...
