<span>Weather variations from year to year are far less dramatic in California than they are in most European wine regions. One major reason is that rain doesn't fall during the growing season in much of California. Napa Valley: The southern part of the valley is the coolest area, thanks to ocean breezes and mists from the San Pablo Bay. Northwards--away from the bay influence--the climate can get quite hot (but always with cool nights). Sonoma: Its climate is similar to Napa's, except that some areas near the coast are definitely cooler. Mendocino and Lake Counties: Cool climate. The San Francisco Bay: Cool breezes from the Bay. The Santa Cruz Mountains: Cool climate on the ocean side. Gold Country/The Sierra Foothills: Summers can be very hot, but many vineyards are situated as high as 1,500 feet and evenings are very cool. San Luis Obispo: Include the warm and hilly Paso Robles region and the cool and coastal Edna Valley and Arroyo Grande. Santa Barbara: The Santa Maria, Santa Ynez, and Los Alamos Valleys are cool climates that open toward the Pacific Ocean and channel in the ocean air. The southernmost Santa Ynez Valley boasts a cool climate on its western end, while the eastern end of the valley is warm enough to grow red grapes. In the cool western end is the Sta. Rita AVA.</span>
A. Mantle - Convection Currents occur in the mantle of earth, this occurs in the aesthenosphere. The convection currents transfer heat to the surface of the earth which causes magma to break apart. :)
After condensation comes evaporation which eventually leads to precipitation. Without evaporation, precipitation could never happen. Evaporation is the method through which water rises and enables precipitation (water falling) to happen.
There are three types of magma: basaltic, andesitic and rhyolitic magma. Basaltic magma have a characteristic runny liquid magma which contains low silica content. Andesitic magma is the intermediate one in terms of silica content and viscosity. The rhyolitic magma is the thick, high silica content magma.