7th Block Plate Tectonics Unit Summative February, 2024

How does fossil evidence support Wegener's hypothesis of continental drift?

Choose THREE correct answers!

• Similar fossils are found along continental margins that appear to join together.
• Fossils are found in areas where the present-day climate could not have supported the organisms that made the fossils.
• Similar fossils of giant, land-dwelling dinosaurs are found on continents separated by oceans.
• deserts found in central Africa and western Peru and Chile.

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Most tectonic plates have both oceanic and continental crust. How are these crust types different?

• Oceanic is thinner and less dense than continental.

• Continental is thinner than more dense than oceanic.

• Continental is thicker and less dense than oceanic.

• Oceanic is thicker and more dense than continental.

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There are two types of crust in tectonic plates.

What type of rocks are usually found in each?

• They are all igneous because they form from magma or lava; BUT, continental crust is usually granite and oceanic crust is usually basalt.

• Some rocks are more dense than others, so they always subduct when plates collide.

• There is absolutely NO difference in the types of rocks that make up Earth's crust.

• There is only one kind of rocks on Earth, so the crust can't be made of different rocks.

What is the name of these puzzle -shaped pieces of the Earth's surface?

• Tectonic plates
• Jigsaw puzzles

• Earthquakes
• Rift zones

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Originally the Continental drift theory was not well received by other scientist. Why?

• There was a competing theory at the time that was more believable.

• There was no data showing the continents ever moved.

• The scientists did not know the force responsible for moving the continents.

• The scientist presenting the data was unreliable.

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Where did Wegener find plant fossils that today would not be able to survive on that type of land and extremely cold climate?

• North America

• Antarctica

• China

• India

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Coal deposits are part of the evidence for continental drift. Why?

• Coal can only form from sedimentary rocks and new coal deposits have been found in igneous rock faces in the oceans.

• The type of coal deposits mapped as part of continental drift theory formed ONLY from tropical plants.

• Coal deposits in other locations have been burned by the collision of tectonic plates.

• False. Coal is not part of the evidence for continental drift.

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True of False: The continents have always been where they are today

• True

• False

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The difference between continental drift theory and plate tectonics theory is that plate tectonics includes seafloor spreading as an explanation of for moving the plates.

• true

• false

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This is a picture of glacier scars found in Africa.  What are these evidence for?

• Africa has always been near the equator
• Africa was once in an area of the Earth that had a very cold climate
• The continents have not moved
• sea floor spreading

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