The atmosphere was reducing (no free oxygen). 6. • First evidence for early life • The evolution of life • Extreme life on Earth: lessons for astrobiology. The Origin and Evolution of Life on Earth. Composition of the Air Nitrogen 78% Oxygen 21% Other gases 1% *greenhouse gases: carbon dioxide, water vapor, methane, etc. In the atmosphere, conduction is more effective at lower altitudes where air density is higher; transfers heat upward to where the molecules are spread further apart or transfers heat laterally from a warmer to a cooler spot, where the molecules are moving less vigorously. The Atmosphere 1. The earth was formed by the accretion of solid materials that condensed from the solar nebula.

or deep in the earth's crust ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 1a9e7b-ZDc1Z Find PowerPoint Presentations and Slides using the power of XPowerPoint.com, find free presentations research about Origin Of Earth PPT 3. For example, Earth’s atmosphere contains around 20 parts per million (abbreviated as ppm) of neon gas , the same gas used to produce the bright glow of restaurant signs and cinema marquees. Evolution of the atmosphere, the process by which the current atmosphere arose from earlier conditions. For example, Earth’s atmosphere contains around 20 parts per million (abbreviated as ppm) of neon gas , the same gas used to produce the bright glow of restaurant signs and cinema marquees.

The formation of Earth: The Earth formed over ~50 Myr via planetesimal accretion. . In addition to these major components, the atmosphere also contains very small amounts of other gases that prove especially useful in understanding the origin and history of our atmosphere.

- Primordial heat, collisions and compression during accretion, decay of short-lived radioactive elements – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 47327c-NGVkN Campbell And Reece. Biology is also responsible for repartitioning carbon dioxide between the atmosphere, oceans, and limestone rocks (kinetically favoring the last) by The origin of atmospheric oxygen on Earth: The innovation of oxygenic photosynthesis G ... modified view of the origin of the first oxygenic cyanobacteria is suggested with the Chloroflexus type II reaction center appearing to be the closest type II reaction center protein precursor to cyanobac-terial PSII based on pigment genes. ... Water mixture in “sea” flask was heated; vapor entered atmosphere flask The Atmosphere 2. How have present structures arisen ? Table 1 Components of the oceans, atmosphere, and sedi-mentary rocks not derivable by weathering of primary silicate rocks Chemical species Amount on Earth’s surface not derived by weathering (]1020g) Water 16600 Total carbon as carbon dioxide 910 Chlorine 300 Nitrogen 42 Sulfur 22 After Rubey (1951). The atmosphere at that time was totally different from the atmosphere today. The Origin and Structure of the Universe What is the Universe made of ? The formation of Earth: The Earth formed over ~50 Myr via planetesimal accretion. Probably made up of hydrogen ... or at hydrothermal vents deep in the oceans. The present-day atmosphere is quite different: 78% nitrogen, 21% oxygen, 1% argon, 0.03% carbon dioxide plus small amounts of water vapor . Presentation Summary : CAMPBELL and REECE. The presence of the ancient oceans and lakes is recorded by different … Warmer molecules vibrate rapidly and collide with other nearby molecules, transferring their energy. ATMOSPHERE The atmosphere of is the layer of gases that surrounds the planet Earth and is retained by Earth's gravity. The original atmosphere.

What was the origin of structure ? Conditions on early Earth made the Origin of Life possible. Evidence of these changes, though indirect, is abundant. biology. In addition to these major components, the atmosphere also contains very small amounts of other gases that prove especially useful in understanding the origin and history of our atmosphere. A timeline for the very early history of the Earth. Explicit and implicit meaning Explicit meaning. Overview • The formation of Earth • Pre-biotic chemistry (Miller-Urey exp.) -- the dimensionality of space-time -- the standard model of particle physics -- the periodic table/element abundances -- planets, stars, black holes and galaxies -- large-scale and cosmological structure . Early in Earth history, water vapor formed clouds, rain, and ultimately all of the surface water (oceans, ground water, lakes, rivers, glaciers). The atmosphere is the blanket of air that surrounds the Earth.