About This Chapter
How it works:
- Identify which concepts are covered on your geologic time and earth science homework.
- Find videos on those topics within this chapter.
- Watch fun videos, pausing and reviewing as needed.
- Complete sample problems and get instant feedback.
- Finish your geologic time and earth science homework with ease!
Topics from your homework you'll be able to complete:
- The geologic time scale
- Theories of geological evolution
- Fossil preservation conditions
- Numerical and relative dating
- Radiometric dating
1. Geologic Time Scale: Major Eons, Eras, Periods and Epochs
The geologic time scale is an essential tool for understanding the history of Earth and the evolution of life. In this lesson, explore the principal eons, eras, periods, and epochs that help us track major events in geologic history.
2. Theories of Geological Evolution: Catastrophism vs Uniformitarianism
Geologists haven't always agreed about the history of our planet. They have debated between catastrophism and uniformitarianism over the last few hundred years! Learn about the two main theories of geologic evolution and how scientists came to resolve the dispute.
3. Methods of Geological Dating: Numerical and Relative Dating
Learn how scientists determine the ages of rocks and fossils. We'll explore both relative and numerical dating on our quest to understand the process of geological dating. Along the way, we'll learn how stratigraphic succession and radioactive decay contribute to the work of paleontologists.
4. What is Relative Dating? - Law of Superposition, Principles of Original Horizontality & Cross-Cutting Relationships
Discover how geologists study the layers in sedimentary rock to establish relative age. Learn how inclusions and unconformities can tell us stories about the geologic past. We'll even visit the Grand Canyon to solve the mystery of the Great Unconformity!
5. 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.
6. Radiometric Dating: Methods, Uses & the Significance of Half-Life
Radiometric dating is used to estimate the age of rocks and other objects based on the fixed decay rate of radioactive isotopes. Learn about half-life and how it is used in different dating methods, such as uranium-lead dating and radiocarbon dating, in this video lesson.
7. Conditions of Fossil Preservation: Rapid Burial, Hard Parts & the Elements
Learn how fossils are formed and how varying conditions affect the preservation of organisms. What is the best way for a dinosaur to become fossilized? Find out here!
8. Relative Dating with Fossils: Index Fossils as Indicators of Time
You may already know how to date a fossil with a rock. But did you know that we can also date a rock with a fossil? Watch this video to find out how we use index fossils to establish the relative ages of rocks.
9. What is Rubidium? - Properties, Uses & Facts
Ever noticed the bright colored fireworks in the 4th of July night sky? Maybe you have wondered where the pretty reds and purples come from. Read on in this lesson to discover what role rubidium plays.
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Other chapters within the Earth Science: Homework Help Resource course
- Earth Science Basics: Homework Help
- Properties of Matter: Homework Help
- Earth's Spheres and Internal Structure: Homework Help
- Plate Tectonics: Homework Help
- Minerals and Rocks: Homework Help
- Igneous Rocks: Homework Help
- Volcanoes: Homework Help
- Weathering and Erosion: Homework Help
- Sedimentary Rocks - A Deeper Look: Homework Help
- Metamorphic Rocks - A Deeper Look: Homework Help
- Rock Deformation and Mountain Building: Homework Help
- Water Balance: Homework Help
- Running Water: Homework Help
- Ground Water: Homework Help
- Glaciers: Homework Help
- Oceans: Homework Help
- Coastal Hazards: Homework Help
- The Atmosphere: Homework Help
- Weather and Storms: Homework Help
- Earthquakes: Homework Help
- Earth History: Homework Help
- Energy Resources: Homework Help