GED, ACT, SAT & GRE Test Guide 2021: FREE Practice Tests & Online Classes

  • Home
  • GED Practice Tests
    • GED Math Practice Tests
    • GED Science Practice Tests
    • GED Social Studies Practice Tests
    • GED Reasoning Through Language Arts Practice Test
  • Online GED Classes
    • GED Math Classes
    • GED Science Classes
    • GED Social Studies Classes
    • GED English Classes
  • GED
    • GED Math
    • GED Science
    • GED Social Studies
    • GED Reading/Writing
    • GED Study Guide
  • ACT
    • Best ACT Prep Course Reviews
    • Best ACT Prep Book
    • Magoosh ACT Review
    • PrepScholar ACT Review
    • ACT Registration
    • ACT Test Dates
    • ACT Scores
    • ACT Practice Tests
  • SAT
    • Best SAT Prep Course Reviews
    • Best SAT Prep Book
    • Magoosh SAT Review
    • Kaplan SAT Prep Review
    • PrepScholar SAT Review
    • SAT Test Dates
    • SAT Registration
    • SAT Requirements
    • SAT Scores
    • SAT Practice Tests
    • Essay SAT Prompts
  • GRE
    • Best GRE Prep Course Reviews
    • Best GRE Prep Book
    • Magoosh GRE Prep Review
    • Kaplan GRE Prep Review
    • Manhattan Prep GRE Review
    • Magoosh vs. Kaplan GRE
    • GRE vs GMAT – Significant Difference between GRE and GMAT
    • GRE Scores
    • GRE Practice Tests
  • GMAT
    • Best GMAT Prep Book
    • Best GMAT Prep Course
    • Magoosh Gmat Review
  • MCAT
    • Best MCAT Prep Courses
    • Magoosh MCAT Review
    • Kaplan MCAT Review
    • Kaplan vs Princeton Review MCAT
  • LSAT
    • Best LSAT Prep Course
    • LSAT vs. GMAT
    • Kaplan LSAT Review
    • Magoosh LSAT Review
    • Manhattan Prep LSAT Review
Home » GED Exam » The Four Spheres of Planet Earth

Mar 20 2018

The Four Spheres of Planet Earth

One of the topics under the GED Science Test is Earth Science. It covers the four spheres of planet earth.

The Earth, the planet we call home, how much do you know about it? Sure, you know that it looks like an imperfect circle, a little flat at the top and a little bulged on the sides. You know about the sea and the sky and about the land that you stand on. But there is more to our home planet than those things.  For example, have you ever wondered what is in the center of the earth or what it’s called? And most importantly, will you be able to answer if this topic appears in the GED test? All these questions will be answered once you understand the earth and its four spheres – lithosphere, hydrosphere, biosphere, and atmosphere.

Visit our website: GED Science Classes Online

Lithosphere

GED Science Test

All the four spheres of the Earth, the lithosphere is one of the most mysterious. What’s ironic is that it is also the sphere where we live. The lithosphere is composed of the crust, the mantle, and the core. The crust is composed of soil and rocks and those buildings we built on it. The crust is more or less 40 kilometers in thickness.

Below the crust is the mantle which is a giant river of molten rock and silica flowing under the crust and over the core. With a thickness of about 2,660 km, the mantle’s movement inside the earth is so strong that it could move big continents at its will. The continents of the planet float helplessly on the mantle and when these big pieces of the crust collide, you will experience an earthquake. The mantle is also the main actor in the creation of volcanos.

Below the crust is the outer and inner core. Rotating in the absolute center of the earth in opposite directions, the inner and outer core power up the processes that make our planet dynamic and supportive of life. Without the core, we would have less gravity. Without the core, the processes that created the conditions that started life would not exist and we would not be here.  The core also creates the magnetic field that protects the planet from harmful radiation from the sun and other sources. The most amazing thing about the core is that scientists say it spins 5,000 times faster than the spin of the earth. Imagine how fast that is.

Related Topic: GED 101: 2019 GED Practice Tests, GED Classes for GED Exam – 1 Stop GED Programs Guide

Hydrosphere

GED practice tests

The hydrosphere is composed of water in all its state – liquid, solid and gas. That means the seas, oceans, rivers, and lakes, as well as water underground all, belong to the hydrosphere since they are water in liquid form. Glaciers, icebergs and the snow piling up on the road during winter is part of the hydrosphere as a solid form of water.  Finally, the water vapor, steam and clouds being the gas form of water are also part of the hydrosphere. The thickness of the hydrosphere extends several kilometers into the lithosphere and 12 or more kilometers into the atmosphere.

Related Topic: GED Study Guide

Biosphere

GED study guide

The biosphere consists of all living things on the planet. From the lowly bacteria under the earth’s crust to the fierce lion stalking in the savannah to the human beings living on the international space station in space, as long as something is living, it is part of the biosphere. Within the biosphere, living organisms live and build their own ecological communities based on the ecosystem they are on. These communities are called biomes. The biosphere extends to wherever a living thing is found.

Related Topic: GED Prep

Atmosphere

GED classes online

The most popular among the four spheres of the earth is the atmosphere. Extending from 1 meter below the ground to ten kilometers above ground, the atmosphere has a very big influence in human life. First, it is important to acknowledge that the atmosphere refers to air including the oxygen we breathe and the various gases that make up air. The more carbon dioxide we release into the atmosphere, the less oxygen we breathe. But that’s not the only way the atmosphere affects us. Weather and climate are conditions affected by the atmosphere. The wind you enjoy or the tornado that you fear, are all created in the atmosphere.

The atmosphere is also at the receiving end of human abuses. Every time you burn something, the smoke (carbon dioxide) goes up into the atmosphere and makes it dirty. Every time you drive your car, it releases various gasses that go into the atmosphere. As the atmosphere is filled with pollution, humans experience acid rain, smog, and extreme weather conditions. In the end, whatever we do to the atmosphere will come back to bite us in the hand.

The lithosphere, the biosphere, the hydrosphere and the atmosphere make up the planet we call home. We affect these spheres, in the same way, affect us. Now that you know the four spheres of the earth, you will be able to answer when it appears on your GED test. Learn more about it by signing up for our GED online classes and taking GED science practice tests.

Related Topics:

  • Free GED Math Practice Test
  • Free GED Practice Tests (2019)
  • 7 Tips to Improve Your Reading Comprehension Skills for GED
  • GED Math
  • GED Science Study Guide
  • GED Social Studies Prep Guide
  • GED Reasoning through Language Arts Guide
  • GED Practice Test for Science Exam
  • GED Science Practice Test 1
Watch our Online GED Math Videos covering all topics you will face during the GED Math test

Written by Abi · Categorized: GED Exam · Tagged: Four Spheres of Planet Earth, free GED classes, GED classes online, GED Earth Science, GED online, GED online classes, GED Practice Tests, GED Science test, GED Study Guide, GED Test, online GED, Online GED Classes

Subjects

  • SAT
  • GED
  • ACT
  • GRE




Math Tests

  • Data, Probability, and Statistics
  • Decimals and Fractions
  • Equations, Inequalities, and Functions
  • Geometry
  • Number Sense and Problem Solving
  • Ratio, Proportion and Percent
  • Algebra Basics, Expressions and Polynomials
  • Bonus Math Test
  • Bonus Math Test
  • Bonus Math Test




GED Resources

  • GED Test Guide (UPDATED)
  • GED Practice Tests
  • Online GED Classes
  • GED Math Test Guide
  • GED Math Practice Test
  • GED Math Practice Test 2
  • GED Math Practice Test 3
  • GED Math Practice Questions
  • Math Sample Questions
  • GED Math Test with Extra Tips
  • GED Math Online Classes
  • GED Science Test Guide
  • GED Science Practice Test 1
  • GED Science Practice Questions
  • GED Reading Practice Test
  • GED Reading Practice Test 1
  • GED Reading Practice Questions
  • GED Reading Art Language Practice Lessons
  • GED Writing Practice Test
  • GED Science Online Classes
  • GED Social Studies Practice Test
  • GED Social Studies Practice Test 1
  • GED Social Studies Practice Lessons




Test Prep Toolkit

[email protected]
About Test Prep Toolkit
Contact Us

Trustpilot

Most Popular Tests

  • GED
  • ACT
  • SAT
  • GRE

Information

Privacy Policy
Terms of Service
DMCA
Exam Ownership and Trademarks

Contact Us

Email
Contact Page
Facebook
YouTube

Testpreptoolkit.com is owned and operated by Bright Light Publishing LLC in MICHIGAN USA. © Testpreptoolkit.com 2019. All Rights Reserved.
TEST PREP TOOLKIT
  • Home
  • GED Practice Tests
    • GED Math Practice Tests
    • GED Science Practice Tests
    • GED Social Studies Practice Tests
    • GED Reasoning Through Language Arts Practice Test
  • Online GED Classes
    • GED Math Classes
    • GED Science Classes
    • GED Social Studies Classes
    • GED English Classes
  • GED
    • GED Math
    • GED Science
    • GED Social Studies
    • GED Reading/Writing
    • GED Study Guide
  • ACT
    • Best ACT Prep Course Reviews
    • Best ACT Prep Book
    • Magoosh ACT Review
    • PrepScholar ACT Review
    • ACT Registration
    • ACT Test Dates
    • ACT Scores
    • ACT Practice Tests
  • SAT
    • Best SAT Prep Course Reviews
    • Best SAT Prep Book
    • Magoosh SAT Review
    • Kaplan SAT Prep Review
    • PrepScholar SAT Review
    • SAT Test Dates
    • SAT Registration
    • SAT Requirements
    • SAT Scores
    • SAT Practice Tests
    • Essay SAT Prompts
  • GRE
    • Best GRE Prep Course Reviews
    • Best GRE Prep Book
    • Magoosh GRE Prep Review
    • Kaplan GRE Prep Review
    • Manhattan Prep GRE Review
    • Magoosh vs. Kaplan GRE
    • GRE vs GMAT – Significant Difference between GRE and GMAT
    • GRE Scores
    • GRE Practice Tests
  • GMAT
    • Best GMAT Prep Book
    • Best GMAT Prep Course
    • Magoosh Gmat Review
  • MCAT
    • Best MCAT Prep Courses
    • Magoosh MCAT Review
    • Kaplan MCAT Review
    • Kaplan vs Princeton Review MCAT
  • LSAT
    • Best LSAT Prep Course
    • LSAT vs. GMAT
    • Kaplan LSAT Review
    • Magoosh LSAT Review
    • Manhattan Prep LSAT Review