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Igneous
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Formed from the hardening of molten rock, magma, lava.
Ex: granite, pumice, basalt, obsidian. |
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Sedimentary
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Formed by sedimentation, gradual depositing or small bits of rock or clay. FOSSILS. Shale, sandstone, gypsum, dolomite, coal.
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Metamorphic
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Formed when existing rock material is altered through temperature, pressure, or chemical process. Ex: marble, slate, gneiss, quartzite.
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Age of Earth
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4.6 billion years old
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Precambrian Eon
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4.6 billion years ago - 570 million years ago. Before the fossil record began.
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Life on Earth
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3.5 billion years ago
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