TEPHRA AND PYROCLASTIC ROCKS. The rapid eruption of expanding gases results in the obliteration and fragmentation of magma and rock. The greater the explosivity, the greater the amount of fragmentation. Individual eruptive fragments are called pyroclasts (fire fragments).Tephra (Greek, for ash) is a generic term for any airborne pyroclastic accumulation.Whereas tephra is unconsolidated, a pyroclastic rock is produced from the consolidation of pyroclastic accumulations into a coherent rock type.he greater the explosivity, the greater the amount of fragmentation. Individual eruptive fragments are called pyroclasts (fire fragments). Tephra (Greek, for ash) is a generic term for any airborne pyroclastic accumulation.
Test the temperature of the milk with an instant-read thermometer once the milk has begun to steam and show small bubbles. Milk is considered to be scalded once it exceeds a temperature of 180 degrees F. Select a heat-proof measuring cup that is capable of holding at least twice as much milk as you wish to heat.
I personally donât drink pasteurized milk and wouldnât recommend it to anyone. Ultra-Pasteurized â This is the majority of our milk today, what you would typically find in a grocery store. Ultra-pasteurization heats the milk to 280Âº for only a few seconds. The reason for using ultra-pasteurization is because it kills everything. Ultra pasteurization not only kills potentially harmful bacteria in the milk, but also damages all of the vitamins, minerals and other nutrients originally contained in the milk.