lessons 7.1,7.2
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| eons | the longest units of geologic time
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| era | eons are subdivided into smaller units of time
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| period | eras subdivided into periods
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| epoch | periods are subdivided into epochs
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| mass extinction | the extinction of many species on Earth within a short period of time
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| land bridge | connects two continents that were previously separated
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| geographic isolation | the separation of a population of organisms from the rest of its species due to some physical barrier, such as a mountain range or an ocean
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| `Paleozoic era | the oldest era of the Phanerozoic eon
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| Mesozoic era | the middle era of the Phanerozoic eon
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| Cenozoic era | the youngest era of the Phanerozoic eon
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| inland sea | is a body of water formed when ocean water floods continents
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| coal swamp | an oxygen-poor environment where, over time, plant material changes into coal
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| supercontinent | an ancient landmass which separated into present-day continents
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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