Lecture 4

Lecture 4 - The H abitability of Earth Why is the Earth...

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The Habitability of Earth
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Why is the Earth Special? Geology and Life The history of Earth Geology and Habitabilit y The Hadean Earth and Life Climate Regulation Goldilocks Principle: life needs a planet that is not too hot, not too cold, but just right! The Moon and Mercury = airless and barren, impact scarred surfaces. Venus = searing hothouse, high surface temperatures and pressures. Mars = has features that look earth-like, hospitable past? Why is the Earth so special? Distance from Sun? Larger Size? Science in Action
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How is geology crucial to our Geology and Life The history of Earth Geology and Habitabilit y The Hadean Earth and Life Climate Regulation Geology – the study of the Earth, or any world with a solid surface. Over long time-scales, geology and life are deeply intertwined. Earth’s geology has enabled our planet to be habitable. Science in Action
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Volcanism Geology and Life The history of Earth Geology and Habitabilit y The Hadean Earth and Life Climate Regulation Volcanism: Volcanic activity releases gases trapped inside the Earth. These gases were the original source for the Earth’s atmosphere and oceans. Volcanism release heat. Linked to the origins of life on Earth? Mt. Etna, Italy Mt. Kilimanjaro Science in Action
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Plate Tectonics Geology and Life The history of Earth Geology and Habitabilit y The Hadean Earth and Life Climate Regulation Earth’s surface shaped by the movement and recycling of rock between the surface and the interior = process of plate tectonics . Continents on the Earth have been rearranged over 4 billion years. Plate tectonics largely responsible for the long-term Science in Action
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Magnetic Field Geology and Life The history of Earth Geology and Habitabilit y The Hadean Earth and Life Climate Regulation Earth has a global magnetic field i.e. why compass needles point north. Field generated deep in the interior of the planet. Birds use the magnetic field to guide their migrations. Significant mostly for our atmosphere! These factors are all important, so it is important to learn the likelihood of finding them on other worlds. Science in Action
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The Geological Record Geology and Life The history of Earth Geology and Habitabilit y The Hadean Earth and Life Climate Regulation If humans have only been around a few thousand years out of 4.5 billion, then how do we know anything about the Earths’ history? Rocks and Fossils! = The Geological Record The Rock Igneo us Metamorph ic Sediment ary Science in Action Basalt, Granite Quartzite, Slate Sandstone, Limestone
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Sedimentary Strata Geology and Life The history of Earth Geology and Habitabilit y The Hadean Earth and Life Climate Regulation Sedimentary rocks important for fossils and produces a record of time!
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Lecture 4 - The H abitability of Earth Why is the Earth...

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