About This Chapter
Basics of Earth History & Geologic Time - Chapter Summary
Review the foundations of our planet's history with this convenient online science chapter. As you progress through the chapter, you'll learn about the major events that occurred on Earth's geologic time scale. The chapter also includes instruction on radiometric dating, the Ice Age and the history of life on Earth. By the end of the chapter, you should be equipped to:
- Assess the forming of the Milky Way galaxy and the planet Earth
- Identify radiometric dating principles
- Evaluate the development and extinctions of life on Earth
- Explain how the course of life on Earth was affected by major catastrophic events
- Summarize the history of the Ice Age
Work through the chapter at your own pace, and take the included self-assessment quizzes to make sure you fully understand the material. If you have any questions, you can submit them online to our expert instructors. For your convenience, we've made the chapter available 24/7 and accessible on any device that has an Internet connection.
1. The Formation of the Milky Way Galaxy
This lesson will explore two hypotheses as to how the Milky Way galaxy formed. These are the top-down and bottom-up hypotheses. We'll also go into what special connection you personally have to all of this.
2. Formation of the Earth: Theories
In this lesson, the theory of how the planet Earth formed will be discussed. This includes looking at how it differentiated into three layers, how it formed its atmosphere, water, and land features, and how it continues to evolve today.
3. Principles of Radiometric Dating
Radiometric dating is a method used to determine the age of rocks and other materials based on the rate of radioactive decay. Learn about three common types of radioactive decay: alpha decay, beta decay and gamma decay.
4. Developments & Extinctions of Life on the Geological Time Scale
Is extinction all that bad? In some ways, it might be. But out of the rubble new developments always arise. This lesson shows you how this is so with a couple examples.
5. How Major Catastrophic Events Disrupt the Course of Life on Earth
Do you know that, smart as we are, we can be destroyed any second? History provides us with many catastrophic events that led to mass destruction and this lesson covers a couple.
6. Ice Age: Definition, History & Timeline
What is an ice age and what factors interact to cause them? This lesson helps answer those questions with the help of graphics and discussion. A lesson summary and brief quiz are also included.
Earning College Credit
Did you know… We have over 220 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.
To learn more, visit our Earning Credit Page
Transferring credit to the school of your choice
Not sure what college you want to attend yet? Study.com has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.
Other chapters within the M-STEP Science - Grade 11: Test Prep & Practice course
- Scientific Inquiry & Reflection
- Earth Systems Overview
- Energy & Biochemical Cycles in Earth Systems
- Human Impacts on Earth Systems
- Advanced Rock Cycle
- The Interior of the Earth
- Plate Tectonics Theory
- Earthquakes & Volcanoes Overview
- Hydrogeology Overview
- Oceans & Climate
- Weather and Storms
- The Earth & Sun as a Part of a Galaxy
- Climate Change
- Transformation of Matter & Energy in Cells
- Living Organism Composition
- Interdependence of Living Systems & the Environment
- Ecosystems & Populations
- DNA & Mutations
- Mitosis & Meiosis
- Evolution & Biodiversity
- Physics & the Motion of Objects
- The Physics of Forces & Motion
- Forms of Energy
- Basics of Waves
- Light, Electricity & Nuclear Reactions
- Energy Transfer & Conservation
- Properties & States of Matter
- Chemical Changes in Matter
- M-STEP Science - Grade 11 Flashcards