Write a 600 word essay on the Cambrian explosion of life. Include hypotheses on why it happened, and the major groups that got started. Write a 600 word essay on Gondwana. Include continents involved, position of Gondwana, and the major flora and fauna. Write a 600 word essay on the Permian extinction event. Include why it happened, and which groups disappeared permanently. Write a 600 word essay on the origin and history of the Navajo Sandstone Formation. Include the age, major sedimentary structures, and the paleoenvironment. Write a 600 word essay to explain what was happening to have the Paleocene-Eocene Thermal Maximum (PETM). MUST be your own original work, no direct quotes, but you must use the appropriate jargon. (i.e. to describe the porosity and permeability of an aquifer should NOT be explained as ‘absorbent and leaky.’ Sounds like a diaper! It should be described in terms of porosity and permeability.)