History of Earth Webquest Formation of the Earth – Flashcards
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age of universe
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13.7 billion years old
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formation of the solar system
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4.6 billion years ago
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four terrestrial planets
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Earth, Venus, Mars, Mercury.
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protoplanet
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form from the smaller groups of bodies
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Nebula
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clouds of gases and dust in space
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Sun
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mostly made of Hydrogen and Helium gas
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Mantle
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semi-fluid layer made up mostly of the mineral Olivine
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Crust
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made up of low-density, silicate minerals such as Feldspar and Quartz
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Inner core
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made of solid Iron and Nickel
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Outer core
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made of liquid Iron and Nickel
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Lithosphere
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cool, rigid outer shell which makes up the tectonic plates
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Asthenosphere
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hot, plastic soft solid which moves in circular patterns
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Mesosphere
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the middle layer-hotter and denser than the other mantle layers
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Nebula Hypothesis
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All bodies in the solar system formed from a cloud of dust and gases.
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Origin of the Earth's Ocean
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formed when outgassed water vapor fell as rain as Earth cooled
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Dead Planet
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without the convection currents it created, earth would eventually become
