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Java Games: Flashcards, matching, concentration, and word search. |
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Ch 19 History of the Earth
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| coevolution | occurs when two or more species reciprocally affect each other's evolution through the process of natural selection |
| Endosymbiotic theory | explains the origin of organelles and the evolution of eukaryotic cells from prokaryotic ancestors |
| paleontologist | a scientist who studies fossils |
| extinct | the complete elimination of a species from the Earth |
| radioactive dating | uses devices such as a Geiger counter to measure the remaining radioactivity of a substance to find out how old a fossil is |
| half-life | how long it takes for a radioactive substance to become half of it's original level of measurable radioactivity (halfway to stable) |
| geologic time scale | eon, era, period, epoch |
| plate tectonics | scientific theory that explains how the Earth's outer shell is divided into large, flowing layers beneath it; this movement causes geological phenomena such as earthquakes, volcanic activity, and the formation of mountains |
| Pangaea | the state of continents before they drifted apart |
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math & science teacher |
Academy of the New Church Girls School |
| Bryn Athyn, PA |
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