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
  Sedimentary rocks are formed by the lithification of the sediments  which accumulate from the erosion of â¦ preexisting rocks of all  types. They also included rocks form from animal and plant remains.   Metamorphic rocks are formed when sedimentary or igneous rocks are  heated and or squashed.1  How Limestone Changes to Marble Marble is a type of metamorphic rock highly prized by builders for its outward beauty. 2  Relatively rare, it forms from limestone, a common type of sedimentary rock. 3  How limestâ¦. Metamorphic rocks are formed when sedimentary or igneous rocks are  heated and or squashed. 1  How Limestone Changes to Marble Marble is a type of metamorphic rock highly prized by builders for its outward beauty.