Part of GED® Science: Earth & Space Science
GED® Science: Earth's Structure & Layers (Deep Dive)
A deep dive into the inside of our planet, expanding the single 'Earth's Structure & Layers' lesson from the GED® Earth & Space Science course into a full mini-course. You will learn why Earth is layered at all, what each layer is made of and how hot and deep it is, the difference between dividing Earth by composition (crust/mantle/core) and by behavior (lithosphere/asthenosphere), how scientists know all this without ever drilling there (seismic waves), and how Earth's churning metal core makes the magnetic field that shields life. Plain language, labeled diagrams, common-misconception warnings, and GED®-style practice with full explanations throughout.
📚 Course Curriculum
Earth is not a uniform ball of rock. It is sorted into layers — dense metal in the center, lighter rock on the outside. But …
Open trial session →The most familiar way to divide Earth is by what each layer is made of — its composition. There are three: the crust, the mantle, …
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Here is the idea that trips up the most students. There are two different ways to divide Earth's interior, and they do not line up. …
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No one has ever been to Earth's core — not even close. The deepest hole humans have ever drilled, the Kola Superdeep Borehole in Russia, …
Open trial session →Earth's interior is astonishingly hot — hot enough at the center to rival the Sun's surface. Two sources keep it that way over billions of …
Open trial session →Let's pull it together. Earth can be divided two ways at once, and a good test-taker keeps them straight:. By composition (what it's made of): …
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Course Syllabus
This self-paced GED® Science course follows a 6-lesson sequence. Work through the modules in order so that each skill supports the next.
Course sequence
Module 1 - Lessons 1-3
- Why Earth Has Layers: Density & Differentiation
- The Compositional Layers: Crust, Mantle & Core
- A Different Slice: Lithosphere & Asthenosphere
Module 2 - Lessons 4-6
- How We Know: Seismic Waves & Evidence
- Earth's Internal Heat & the Magnetic Field
- Boundaries, Two Layer Schemes & Reading the Data
Practice and completion
- Use worked examples and lesson practice to check understanding after each module.
- Review incorrect answers, explain the correction, and repeat weak skills.
- Complete the available mixed or final course practice to demonstrate readiness.
Course Outcomes
By the end of this course, learners will be able to:
- Explain the key scientific ideas and vocabulary in Why Earth Has Layers: Density & Differentiation.
- Interpret observations, data, models, or evidence related to The Compositional Layers: Crust, Mantle & Core.
- Apply scientific reasoning to questions involving A Different Slice: Lithosphere & Asthenosphere.
- Evaluate explanations and identify common errors about Earth's Internal Heat & the Magnetic Field.
- Connect Boundaries, Two Layer Schemes & Reading the Data with other course concepts in mixed practice.
- Use feedback and answer explanations to diagnose and correct mistakes.
- Complete mixed, exam-style practice with clearer reasoning and greater independence.
📝 Practice Questions
29 interactive questions with instant feedback and explanations.
Enroll for free to unlock the full practice bank after the trial sessions.