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The Earths Atmosphere
- 1. The Earths Structure - By Lauren Crust: The thinnest layer between 5-30 kms thick. Mantel: Is divided into two regions, upper and lower. This dense layer is made out of hot semi solid rock. It is around 2600 kms thick. Core: The hottest and liquid layer of the earth, containing iron and nickel. Learning Objectives: ● Describe the early atmosphere of the earth in the terms of its general composition ● Explain how Carbon Dioxide and Water Vapor Decreases ● Explain the process which increased the amount of oxygen ● Describe the composition of the modern day atmosphere Early Atmosphere Modern Atmosphere Volcanoes → Water vapor → Carbon dioxide Oxygen - 21% NH3 (ammonia) Nitrogen - 78%
- 2. CH4 (Methane) Agon - 0.9% - Carbon dioxide - 0.04% - Water vapor - 0-0.4% How did the Atmosphere Changed? -Photosynthesis (CO2 goes in the plant → O2 comes out) - Earth cooled, Water vapor condensed. - As oxygen increased alges began to form. - CO2 was also removed by dissolving into the oceans - Oxygen increased as it was being produced by photosynthesis Questions 1. Why does Iceland have volcanos It lies on the boundary of the tectonic plates. 2. Scientists predict that Katla may erupt soon. However, scientists do not know exactly when Katla will erupt. Suggest one reason why. Not all trimers of plates lead to volcanic activity. 3.During the first billion years of the Earth’s existence its surface was covered with volcanoes. Describe how this volcanic activity led to the formation of oceans The Earth cooled and the water vapor that was released by volcanoes cooled and it had condensed 4. Describe how activity within the Earth results in earthquakes. The molten rock underneath the earths crust condenses sometimes it rises too high and shifts the earth's crust causing an earthquake.