Milk is a mixture of fat, protein, carbohydrate and water. When raw milk sits, the fat separates from the rest of the liquid, rises to the top and forms a layer of cream. The purpose of homogenization is to keep the fat molecules dispersed throughout the milk, so separation does not occur and the milk remains uniform.
In the literature, reported cases of Zone II rupture include the one as described by Naohito et al. [4], of a man falling down stairs resulting in rupture of FDS and FDP. Other cases include one case in the series presented by Naam et al. [2], and 2 cases in the series presented by Imbriglia et al.
Minimum temperatures range from 28o to 1o F, although in some year a big freeze can cause considerable damage to plants. Zone 5 extends from the Puget Sound area in Washington, including Seattle and Tacoma, south along the Pacific Coast to north of Brookings, Oregon, including Astoria, Newport, Coos Bay. Zone 6 Willamette Valley Warmer summers distinguish this Zone from Zone 5, average temperatures being 5o to 9o F higher.