Earth Sciences 2240F/G Chapter Notes - Chapter 13: Calcium Silicate, Calcium Carbonate, Continental Collision
14 Dec 2017
School
Department
Course
Professor
Document Summary
Unit 3: chapter #13: climate - past, present, future. Section a: processes: the search for icehouse - greenhouse control. Icehouse: times when ice sheets are present on continents like antarctica today. Greenhouse: times when continental ice sheets are absent. We have reasonable knowledge of earth"s climate over the past 500 million years (because evidence is better preserved) - relatively none for first 4 billion o. Rock record tells us that earth ahs been habitable for most of it"s existence. Sun energy has increased by 25-30% since earth formed o. If the sun temp decreased by a few percentage points all the water on earth would freeze (even with our current greenhouse) Rock record says liquid oceans have existed ever since earth cooled from the protoplanetary collision 4. 5 bya. First deposit in rock record appears 2. 3bya from local glaciers near the poles. Faint young sun paradox: weak sun yet liquid water.
