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Science

Continental drift and seafloor spreading

QuestionAnswer
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.
Created by: user-1616843
 

 



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