Plate Tectonic Theory
Presentation
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Science, History
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6th - 8th Grade
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Medium
Standards-aligned
April Chen
Used 213+ times
FREE Resource
10 Slides • 4 Questions
1
Plate Tectonic Theory
What are the mechanical layers of the earth?
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3
Why Do We Have Volcanoes, Earthquakes, Mountains and Valleys?
Ever wondered where these formations on earth come from? Many of these actually come from under the earth. But how do we know since we can't actually see deep into the earth?
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What is Inside of Earth?
The Lithosphere is made of the upper mantle and crust
The mantle is made of three different areas. It's the top one, Asthenosphere that the crust moves on top of.
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What Causes the Plates to Move on the Asthenosphere?
Heat from within the mantle rises, cools as it reaches the top, and falls back down.
This concept, Convection, slowly moves the plates on top to move.
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Multiple Choice
Which mechanical layer does convection occur in that pulls the tectonic plates?
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Alfred Wegner
Developed from the 1950s to the 1970s, the theory of plate tectonics is the modern update to continental drift, an idea first proposed by scientist Alfred Wegener in 1912 which stated that Earth’s continents had “drifted” across the planet over time.
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Multiple Choice
Who proposed the theory of plate tectonics?
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Fill in the Blanks
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Pangaea
Pangaea is what Alfred Wegener termed the name of all the continents together at the beginning of time. Pangaea means "all the earth" in greek.
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If we cannot see Plate Tectonics happening, how do we know it's real?
There are a few evidence, or proofs that support Plate Tectonic Theory.
1. The continents fit together almost like puzzle pieces forming Pangaea (one super-continent)
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Evidences for Plate Tectonics
Fossils on different continents are similar to fossils on continents that were once connected.
Most continental and oceanic floor features are the result of geological activity and earthquakes along plate boundaries.
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Evidences cont.
Most distributions of rocks within Earth's crust, including minerals, fossil fuels, and energy resources, are a direct result of the history of plate motions and collisions and the corresponding changes in the configurations of the continents and ocean basins.
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Multiple Select
Plate Tectonic Theory
What are the mechanical layers of the earth?
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