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Students will review:
In this chapter, you'll learn the answers to questions including:
- What subdivisions are found on the geologic time scale?
- What theories do scientists use to explain geological evolution?
- What is the Law of Superposition?
- What is the Principle of Original Horizontality?
- How is radiometric dating used?
- What is the significance of half-life?
- What conditions favor fossil preservation?
- How are relative dating methods used with fossils?
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. Absolute Age: Definition & Dating
Imagine braving the desert heat for days or even weeks as you dig for dinosaur bones. You find something extraordinary and want to know as much about it as you can. In this lesson, you'll learn how scientists determine the absolute age of materials.
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Other chapters within the Introduction to Physical Geology: Help and Review course
- Introduction to Geology: Help and Review
- Earth Materials: Help and Review
- Mineral Types, Properties, and Uses: Help and Review
- Earth and Celestial Rocks: Help and Review
- Igneous Rocks in Geology: Help and Review
- Sedimentary Rocks in Geology: Help and Review
- Metamorphic Rocks in Geology: Help and Review
- Rock Deformation, Geological Folds & Faults: Help and Review
- Weathering, Soil & Erosion: Help and Review
- Running Water in Geology: Help and Review
- Ground Water in Geology: Help and Review
- Glaciers in Geology: Help and Review
- Oceans in Geology: Help and Review
- Deserts and Wind: Help and Review
- Water Balance in Geology: Help and Review
- The Universe: Help and Review
- Earth's Spheres, Surface & Structure: Help and Review
- Atmospheric Sciences: Help and Review
- Earthquakes in Geology: Help and Review
- Plate Tectonics in Geology: Help and Review
- Energy Resources in Geology: Help and Review
- Renewable & Nonrenewable Resources: Help and Review
- Economic Geology & Mineral Resources: Help and Review
- Human Impact on the Earth & Environment: Help and Review
- Environmental Sustainability in Physical Geology: Help and Review
- Environmental Risk Analysis in Physical Geology: Help and Review
- Ethics, Politics & the Environment: Help and Review