ENV100Y5 Chapter 3: ENV100Y5 Lecture :
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ENV100Y5 Full Course Notes
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Document Summary
Inner planets are called terrestrial planets, dominated by rock and metal, higher density. Big objects experience a gravitational force towards the core, creating a spherical shape, like earth. Intense uv radiation from the sun, no ozone layer. Water molecule has chemical characteristics that support life. Liquid over a wide range of temperatures(water based processes occur in a range of condition) High heat capacity (stabilizes systems against change) Transparent to light (photosynthesis is possible under water) Water molecules are polar (can bond with other chemicals) Solid less dense than liquid (floating ice insulates water. Allows aquatic organisms to survive through the winter) Volcanic degassing results to a secondary atmosphere created after the primitive atmosphere was stripped away. Main gas that comes out of volcanoes are water vapor & carbon dioxide. Characteristics: the earth"s early atmosphere was a reducing atmosphere: oxygen-poor, there was oxygen but it wasn"t floating around like o2. Eventually, surface cooled enough to sustain liquid water.
