BIO-240 FA5 Lecture 3: Lecture 3 and 4 Notes
30 Jan 2017
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Document Summary
75% of earth is covered in water. Liquid water is very unique to our earth. Mars, europa (moon of jupiter), enceladus (moon of saturn) and pluto may have/had water or ice. Nebular hypothesis - our solar system was born from a nebula, the planets may have spun themselves into masses around the sun. There"s a spinning chunk of metal that"s thought to protect us from ultraviolet rays. Crust - 2 types, oceanic and continent, is the outer solid layer (where we live) Lithosphere - another way to describe the outer rocky layer of the earth. Geodes - bubbles from volcanoes, sometimes bubbles cool down and turn into gems. Outgassing - air bubbles escape from inside the earth. Oceans formed about 4 billion years ago. The ancient ocean was acidic and not salty, now it"s basic but very salty. Great oxidation event 2. 5 billion years ago - the ozone layer formed because of photosynthesis.
