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define the term rift.
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What was Pangaea?
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Science
Continental drift and seafloor spreading
| Question | Answer |
|---|---|
| define the term rift. | A rift is a large crack, or opening, in Earth’s crust. |
| What was Pangaea? | Pangaea was a single landmass or supercontinent that existed long ago. It was made up of present day continents. |
| What ocean now separates South America and Africa? | The Atlantic Ocean. |
| In what type of climate do glaciers form? | Glaciers form in a climate that is below freezing most of the time. |
| Explain the significance of finding glacial grooves on different continents. | The grooves show that neighboring continents were once part of the supercontinent pangaea. |
| Why did Wegener suggest that continents in the southern hemisphere had a cooler climate long ago? | He found evidence of glaciers- the white areas on the map- in places that are too warm today to have massive ice sheets. |
| What was Glossopteris? | A plant that grew in swamps long ago. |
| Which of the continents would not support Glossopteris growth today? Why? | Antarctica. Swamps do not exist there today because it’s too cold. |
| How were similar rock types used to support the continental drift hypothesis? | Similar rock types in the Appalachian Mountains and the Caledonian Mountains suggest that North America and Northern Europe were ast one time connected as part of a single landmass. |
| Why did scientists argue against Wegener’s continental drift hypothesis? | Alfred Wegener could not explain how continents moved. |
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