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Ch 13: Basics of Earth History & Geologic Time

About This Chapter

If you need to study the basics of Earth's history and geologic time, check out this series of short science lessons and quizzes. Use the chapter to catch up in class, bring up your grades or prepare for an upcoming science exam.

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.

6 Lessons in Chapter 13: Basics of Earth History & Geologic Time
Test your knowledge with a 30-question chapter practice test
The Formation of the Milky Way Galaxy

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.

Formation of the Earth: Theories

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.

Principles of Radiometric Dating

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.

Developments & Extinctions of Life on the Geological Time Scale

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.

How Major Catastrophic Events Disrupt the Course of Life on Earth

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.

Ice Age: Definition, History & Timeline

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.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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