WorksheetsSea-Floor Spreading Review
Total questions: 25
Worksheet time: 13mins
Sea-floor spreading begins at the
Deep ocean trench
Mid-ocean ridge
Continent's edge
What process in the mantle causes plate tectonics?
conduction
convection currents
radiation
Who discovered sea floor spreading?
Harry Hess
Alfred Wegener
Mr. Koob
Mrs. Moody
What is the Mid ocean ridge?
a continental mountain range
a valley system in the middle of the ocean
an underwater mountain range
What words describe M? choose all
deep ocean trench
mid ocean ridge
sea floor spreading
subduction
What is the process happening at R?
Deep ocean trench
mid ocean ridge
subduction
sea floor spreading
Which of the following scientists developed the hypothesis of Continental Drift?
Wegener
Hess
Einstein
Churchill
Originally, the Hypothesis of Continental Drift was not well received by other scientists. Why?
There was a competing theory at the time which was more believable.
There was no data showing the continents ever moved.
The scientists didn't know the force responsible for the moving continents.
The scientist presenting the data was unreliable.
What is the force that causes continents to move?
conduction
convection
radiation
conveyor belts
The cycling of materials due to differences in density is called _______________.
convection
conduction
radiation
molting
Look at this image. Which explanation best summarizes the hypothesis shown in the figure?
The present continents will gradually move to form a single landmass called Pangaea.
The continents were once a large landmass name Pangaea, which broke apart and gradually drifted to the present-day locations of the continents.
The continents were once a large landmass, but the north and south magnetic poles pulled the continents apart toward the poles
The continents were once a large landmass, but the ocean levels rose, and these oceans separate today's continents.
Fossils of the Cynognathus have been discovered on both South America and Africa. How does this evidence help to support the hypothesis of Continental Drift?
This evidence shows that this creature inhabited both continents because is swam across the ocean.
This evidence shows that the two continents have similar climatic conditions.
This evidence shows that the Cynognathus could have flown between the continents over time.
This evidence shows that this creature could not have swum or flown long distances, so the continents were once connected.
Along the mid-ocean ridge, magma rises to the surface and solidifies, forming new sea floor that pushes the older, existing rock in opposite directions away from the ridge is called
sea-floor spreading
ridge push
slab pull
subduction
