About This Chapter
MEGA Earth Science: Plate Tectonics - Chapter Summary
This chapter guides you through the history, theories, and components of plate tectonics, paying particular attention to the kind of subject-relevant topics you'll encounter within the MEGA Earth Science exam, such as:
- The theory of plate tectonics and continental drift
- Earth's tectonic plates and their movement
- Plate boundaries
- Paleomagnetism and hot spots
- Polar reversal and the spreading of the sea floor
You'll be able to verify your knowledge of each lesson topic with practice quizzes that you can take and re-take at your discretion. Instead of having to search back through the lesson when you answer incorrectly, these quizzes provide options to jump right back to the relevant point of the material whenever you get a question wrong, and they can also be printed as worksheets for additional offline study.
1. What is Pangaea? - Theory & Definition
The continents you know have existed for a long time, but not in their current locations. In fact, over 200 million years ago Pangaea broke apart by plate tectonic movement to form the continents we see today.
2. Plate Tectonics: A Unified Theory for Change of the Earth's Surface
After many years of trying to solve the mystery of the moving continents, enough data and evidence was collected to develop a unifying theory of how the surface of the earth changes. It's called plate tectonics.
3. Alfred Wegener's Theory of Continental Drift
People used to think that Earth was static, and that it never changed. Gradually, a body of evidence was gathered that made no sense in this model. Alfred Wegener, Geologic Supersleuth, laid the groundwork for a whole new theory for the large-scale changing nature of the earth.
4. Evidence for the Mechanism of Continental Drift
As scientists began to explore the ocean floor after World War II, they discovered many new clues to help them solve a mystery that had begun decades earlier - how the continents moved about on the surface of the earth.
5. Major Plates of the Lithosphere: Earth's Tectonic Plates
The outer shell of the earth, the lithosphere, is broken up into tectonic plates. The seven major plates are the African plate, Antarctic plate, Eurasian plate, Indo-Australian plate, North American plate, Pacific plate and South American plate.
6. Causes of Tectonic Plate Movement
In this lesson, we explore the causes of plate movement, including thermal convection, ridge push and slab pull. Students will learn how these processes complement each other and form a theory for tectonic plate movement.
7. Plate Boundaries: Convergent, Divergent, and Transform Boundaries
In the theory of plate tectonics, the earth's crust is broken into plates that move around relative to each other. As a result of this movement, three types of plate boundaries are formed: divergent, convergent, and transform boundaries.
8. Ocean Drilling as Evidence for Plate Tectonics
The Deep Sea Drilling Project extracted samples of the ocean floor that provided evidence to support the hypothesis of seafloor spreading and the theory of plate tectonics. Learn how these samples provided proof.
9. Paleomagnetism and Hot Spots: Evidence for Plate Tectonics
Paleomagnetism is the study of past magnetic fields. Hot spots are fixed pockets of heat that well up to form volcanic features. Learn how paleomagnetism and the study of hot spots provide evidence that supports the theory of plate tectonics.
10. Sea Floor Spreading and Polar Reversal
Sea floor spreading is the process by which new oceanic crust is formed by the upwelling of magma through diverging tectonic plates. Learn about the relationship between sea floor spreading and polar reversals detected on the ocean floor.
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Other chapters within the MEGA Earth Science: Practice & Study Guide course
- MEGA Earth Science: Science & Engineering Practices
- MEGA Earth Science: Human Interactions with Earth Systems
- MEGA Earth Science: Earth's Spheres & Internal Structure
- MEGA Earth Science: Minerals & Rocks
- MEGA Earth Science: Measuring Geological Time
- MEGA Earth Science: Energy Resources
- MEGA Earth Science: Processes of Earth's Surface
- MEGA Earth Science: Earth's Hydrosphere
- MEGA Earth Science: Ocean Systems
- MEGA Earth Science: Freshwater Systems
- MEGA Earth Science: Earth's Atmosphere
- MEGA Earth Science: Weather & Storms
- MEGA Earth Science: Climate
- MEGA Earth Science: Astronomical Objects & Processes
- MEGA Earth Science: Solar System
- MEGA Earth Science: The Sun Moon Earth System
- MEGA Earth Science: Space Exploration
- MEGA Earth Science Flashcards