SIO40lecture2

SIO40lecture2 - SIO 40 Life and Climate on Earth Lecture 2...

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SIO 40 – Life and Climate on Earth Lecture 2 - Basic concepts Monday, Sept. 27th
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About 14 billion years ago, the Universe began as an explosion (ie. the “Big Bang”) from a single, infinitely dense point. Formation of helium and deuterium nuclei occurred within about the first 10 minutes, but actual atoms of helium and hydrogen did not form until the Universe was about 300,000 years old, when things cooled to a few thousand ° C. The Universe continued to expand and cool from there, with proto-galaxies beginning to form within the first billion years. Big Bang
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Periodic Table of the Elements
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Nuclear fusion processes in stars resulted in the formation of all elements heavier than hydrogen and helium. Relatively light elements (eg. nitrogen, carbon, oxygen) are formed in red giants. The heaviest elements (eg. iron, copper, gold, lead, uranium) are formed in supernovas. The resulting pattern of elemental abundance in our solar system is shown at top right – note that lighter elements are more abundant. Overall element abundance patterns are reflected in the elemental abundance patterns in Earth (bottom right). Elemental abundance
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Relative Abundance of the Chemical Elements Earth Human Body C, H, O, N, P and S are the major constituents of living tissue. Atomic numbers < 53 – “light” elements
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we are billion year-old carbon, and we’ve got to get ourselves back to the garden….” “Woodstock” by Joni Mitchell,
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This note was uploaded on 05/02/2011 for the course SIO 40 taught by Professor Barbeau,k during the Fall '08 term at UCSD.

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SIO40lecture2 - SIO 40 Life and Climate on Earth Lecture 2...

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