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The ultra-productive agricultural valleys in California wouldn't be productive if it weren't for two things: one artificial and one natural. The artificial one is a vast, man-made irrigation system. The natural one is what?- semi-fertile ultisol soils as found in the agricultural areas of the Piedmont and Coastal Plains of the southeastern U.S.- the national park system in which the mountains and heavily-wooded areas which act as air-conditioning for the whole state.- a series of snow-fed rivers and lakes including the San Joaquín, Sacramento, and Los Angeles Rivers; as well as Lake Tahoe, San Francisco Bay, and the Salton Sea.- the interaction between the Sierra Nevada and the Pacific Ocean

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