Three primary sources of information can be used to answer the question "Could It Happen Here? Tsunamis That Have Struck U.S.
Metamorphic rocks started out as some other type of rock, but have been substantially changed from their original igneous,
The Palmer Drought Severity Index was developed by Wayne Palmer of the U.S. Weather Bureau (now the National Weather Service) in the 1960's and uses temperature and rainfall information in a formula to determine dryness.