Geologic Time

The sites i used were http://www.ucmp.berkeley.edu/education/explorations/tours/geotime/gtpage1.html
The title of this site is called Geologic Time. It showed the different stages of geologic time and was about what eras and periods were.
The second site i used was
http://www.UCMP.berkely.edu/help/timeform.html
The title of this site was UCMP Web Time Machine. It was about how epoches work and also had a geologic time scale.
The era known as the age of the dinosaurs is the mesozic era. The carboniferous period in the palezoic is famous for coal swamps. The ordovian period was the first after the explosion of life. Modern humans first appeared in the epoch of Pleistocene. The event that marked the end of the Mesozoic ERa was a major extinction of dinosaurs. The last Ice ages in Michigan happened during the epoch of Pleistocene. The order of longest to shortest time periods are from era, period then epoch.

Floridas Sinkholes

http://plants.ifas.ufl.edu/guide/sinkholes.html
This site was about the sinkholes in Florida are formed overtime and also karst topography. The title of this site is Sinkhole.
Http://www.wptv.com/content/news/topstories/story/sinkhole-I-4-Florida-hillsboroughcounty/rxvXEru6-EifrzHg5UTPcQ.cspx
This site was about sinkholes in Florida and how they worsen and appear in coller temperatures. The title of this site is Spate of Sinkholes Open up in Florida.
Sinkholes are caused by ground water moving through limestone in the ground, erodeing large void. When water fills the void it supports the walls and ceiling when the water drops the void gets more eroded creating the void to collapse. Florida has so many sinkholes becuase of its karst topography. Sinkholes worsen and appear in cold temps because farmers growing crops pump groundwater from wells and spray it over the crops, the water level decreases because of what the farmers have done to the plants. Besides property damage, another hazard associated with sinkholes is they contaminate groundwater.