Bonnie Branch 6th Grade - 4-3 / 4-4 Drifting Continents / Sea-Floor Spreading
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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| Pangea | The name of the single landmass that broke apart about 300 million years ago to create today's continents.
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| continental drift | The hypothesis that the continents slowly move across Earth's surface.
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| fossil | Any trace of an ancient organism preserved in rock.
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| mid-ocean ridge | The longest chain of mountains in the world found under the sea where ocean floor is produced.
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| sonar | A system that determines the distance of an object under water by recording echoes of sound waves.
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| sea-floor spreading | The process by which molten material adds new oceanic crust to the ocean floor.
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| deep-ocean trench | Deep underwater canyons on the ocean floor where crust slowly sinks toward the mantle
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| subduction | The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle.
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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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