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Java Games: Flashcards, matching, concentration, and word search. |
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Earth Science: Earth History
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| eras | The 4 largest subdivisions of the geological time scale: Precambrian, Paleozoic, Mesozoic, Cenozoic |
| periods | subdivisions of eras |
| epochs | subdivisions of periods on the geological time scale |
| geological time scale | a chart of the Earth's history showing events, time units, and ages |
| organic evolution | the gradual change of life forms through time |
| species | a group of organisms that are similar to each other |
| natural selection | process whereby some organisms survive while others die |
| Precambrian Era | oldest and longest era |
| Paleozoic Era | the second oldest era; began when organisms developed hard parts |
| Mesozoic Era | Middle era |
| Cenozoic Era | Most recent era |
| How old is the Earth? | 4.6 billion years |
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Resource Instructor |
Louisa County High School |
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