The history of life has been punctuated by several mass extinctions. For example, the impact of a meteorite may have wiped out most of the dinosaurs and many forms of marine life at the end of the Cretaceous period (see Chapter 23). Fossils indicate that plants were less severely affected by this mass extinction. What adaptations may have enabled plants to withstand this disaster better than animals?
James Weather and Climate Doppler radar -velocity radar (radiovelocity = velocity data) -if its moving directly perpendicular to the object the velocity is zero -pulse that go out are all horizontal 1980's lightning detection systems -owned by a private sector -ground based system across the U.S. 1990's weather observation (ASOS) 2000's dual pol doppler weather radar -can tell about the shape of the hydrometeor -reflectivity tells that it's there -velocity tells the speed -dual pol = sending out horizontal then vertical pulses 2011 April and May tornado outbreaks -still losing a couple hundred people even w/technology -missing education and communication about life saving information >> eliciting a response from the audience