how well the flu vaccine is matched to flu viruses that are causing illness. Over a period of 31 seasons between 1976 and 2007, estimates of flu-associated deaths in the United States range from a low of about 3,000 to a high of about 49,000 people.
metamorphic rocks form from heat and pressure changing the original or parent rock into a completely new rock the parent rock can be either sedimentary igneous or even another metamorphic rock the word metamorphic comes from greek and means to change form the diagram above shows you how the rocks on earth have been changed continually over time from one rock type to another
What kind of rock is formed when existing rocks are changed by pressure or heat? Changes in the structure, texture, or mineralogy of existing rocks will create a metamorphic rock. Metamorphism can result from the effects of heat and/or pressure, or from â¦ the addition of ions from heated fluids.