I can think of one...
there is gravity pulling everything to the center of the earth, therefore the earth is spherical because gravity is equally distributed, pulling everything to Earth's center equally.
Actually, California is one of the most geologically complex area in the world. Which contribute to its vast amount of water reserve.
This make California a desirable environment for a lot of plants and animals which makes California as one of the best wildlife reserves in the world
hope this helps
Here's a few: Gold, Titanium, Zicronium, Cement, and Soda Ash.
