PHS ES Earth's History Chp. 13
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| shields | a large relatively flat expanse of ancient metamorphic rock within the stable continental interior.
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| photosynthesis | the process by which plants, algae, and certain prokaryotes use light energy to convert water and carbon dioxide into energy-rich glucose molecules.
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| prokaryotes | organism whose cells lack a nucleus and some other cell structures
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| stromatolites | structure produced by algae trapping sediment and forming layered mounds of calcium carbonate
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| eukaryotes | an organism whose cells contain nuclei
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| mass extinction | when many types of living things become extinct at the same time.
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| Gondwana | late Paleozoic continent that formed the southern portion of Pangaea, consisting of all parts of present-day South America, Africa, India and Antarctica
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| Laurasia | the continental mass that formed the northern portion of Pangaea, consisting of present-day North America and Eurasia
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| amphibian | a vertebrate that lives part of its life on land and part of its life in water
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| reptile | vertebrate with scaly skin that lays eggs with tough, leathery shells
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| Milankovitch cycles | cycles related to Earth's movements, such as its orbit around the sun, that scientists think may help to cause ice ages.
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| mammal | animal that bears live young and maintains a steady body temperature
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| gymnosperm | seed-bearing plant that bears its seeds on the surfaces of cones
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| angiospherm | flowering plant that produces seeds within a fruit
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