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Free 5-day trial 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. As we age, our hair turns gray, our skin wrinkles and our gait slows.

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However, rocks and other objects in nature do not give off such obvious clues about how long they have been around.

So, we rely on radiometric dating to calculate their ages.

Moreover, minerals and rocks are an important first step in understanding other topics in geology that will be discussed later.

In this topic we will take a look at how the Theory of Plate Tectonics developed and provide concrete evidence that support the theory.

Below are some additional resources to help you along the way, prepare you for your midterm exam and the Earth Science Regents exam.

The resources below vary in content, but may prove useful throughout the year.

Free 5-day trial This quiz and worksheet will gauge your understanding of absolute age.

The quiz will also assess your comprehension of concepts like how scientists figure the age of any material.

The Physical Setting: Earth Science is related to the field of science called Earth Science.