Bonnie Branch 6th Grade - 9-2 / Finding the Relative Age of Rocks
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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relative age | A rock's age compared to the ages of other rocks.
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absolute age | The number of years since the rock formed.
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law of superposition | In horizontal sedimentary rock layers, the oldest is on the bottom and each higher layer is younger than the layer beneath it.
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uncomformity | A gap in the geologic record showing where some rock layers have been lost because of erosion.
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fault | A break in Earth's crust.
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intrusion | An igneous rock layer forms when magma pushes into bodies of rock beneath the surface and cools (always younger than the rock layers it pushed into).
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extrusion | Lava that cools and hardens into igneous rock on the surface (always younger than the layers below it).
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index fossil | A fossil that is widely distributed and represents a type of organism that existed only briefly.
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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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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.
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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