topic: continental drift essential question: what evidence supports the theory of continental drift?
TRANSCRIPT
Topic: Continental Drift
Essential Question: What evidence supports the theory of continental drift?
Topic: Continental DriftEssential Question: What evidence supports the theory of continental drift?
Alfred WegenerIn the early 1900’s Alfred Wegener proposed the theory of continental drift
Continental DriftAll of the continents were once connected together to form the super continent, Pangaea
Topic: Continental DriftEssential Question: What evidence supports the theory of continental drift?
Continental DriftAll of the continents have drifted to where
they are nowEarth’s lithosphere (crust) is divided into
tectonic plates
Topic: Continental DriftEssential Question: What evidence supports the theory of continental drift?
EvidenceAfrica and South America’s coastlines fit together like a puzzle
Topic: Continental DriftEssential Question: What evidence supports the theory of continental drift?
EvidenceFossils and types of rocks on the eastern coast of S. America matched those on the west coast of Africa
A closer look…
Topic: Continental DriftEssential Question: What evidence supports the theory of continental drift?
EvidenceScientists were able to use new technology to find ocean features such as trenches, seamount chains (mountains on the sea floor), and mid-ocean ridges
Topic: Continental DriftEssential Question: What evidence supports the theory of continental drift?
Harry Hessproposed that at mid-ocean ridges, magma flows up from the mantle and forms new crust on both sides of the ridge
This new crust makes the ocean floor wider and pushes the continents surrounding it further away from each other
Identifying Important Information
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• You should not highlight everything, What we are highlighting will help us answer the essential question:
• What evidence supports the theory of continental drift?
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answer to your question• We will do this together
Topic: Continental DriftEssential Question: What evidence supports the theory of continental drift?
Alfred WegenerIn the early 1900’s Alfred Wegener proposed the theory of continental drift
Continental DriftAll of the continents were once connected together to form the super continent, Pangaea
What is the theory of continental drift?
Topic: Continental DriftEssential Question: What evidence supports the theory of continental drift?
Continental DriftAll of the continents have drifted to where
they are nowEarth’s lithosphere (crust) is divided into
tectonic plates
What are tectonic plates?
Topic: Continental DriftEssential Question: What evidence supports the theory of continental drift?
EvidenceAfrica and South America’s coastlines fit together like a puzzle
Topic: Continental DriftEssential Question: What evidence supports the theory of continental drift?
EvidenceFossils and types of rocks on the eastern coast of S. America matched those on the west coast of Africa
Topic: Continental DriftEssential Question: What evidence supports the theory of continental drift?
EvidenceScientists were able to use new technology to find ocean features such as trenches, seamount chains (mountains on the sea floor), and mid-ocean ridges
What are 3 pieces of evidence that support the theory of continental drift?
Topic: Continental DriftEssential Question: What evidence supports the theory of continental drift?
Harry Hessproposed that at mid-ocean ridges, magma flows up from the mantle and forms new crust on both sides of the ridge. This is called Sea-Floor Spreading.
This new crust makes the ocean floor wider and pushes the continents surrounding it further away from each other
What happens at mid-ocean ridges?
Now let’s write a summaryLook at each question you wrote on your
own, and answer each question in a complete sentence.-What is the theory of continental drift?-What are tectonic plates?-What are 3 pieces of evidence that support the theory of continental drift?
-What happens at mid-ocean ridges?
