Chapter 21.2 relative age dating of rocks


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  3. Ch 21 Fossils and the Rock Record - ppt download

A gap in the geologic rock record. When sedimentary rocks overlie at an angle to horizontal sedimentary rocks. Sedimentary rocks overlie non-sedimentary rocks suggesting uplift of the non-sedimentary rocks. The actual age of the rock or fossil is determined. The emission of radioactive particles and the resulting change into other elements over time.

Once the emission begins the rate of decay is a constant regardless of the environment, pressure, temperature, or other physical changes. Process of calculating the ratio of parent nuclei to daughter nuclei within a given sample of a rock or a fossil. Atoms of the same element that have different mass numbers and the same chemical properties. Combined number of protons and neutrons in the nucleus of an atom.

Period of time it takes for a radioactive isotope, such as carbon , to decay to one-half of its original amount.

In a similar sense Uranium with a half life of , years would not be very useful for dating objects only a couple thousand years old. Bands of alternating light and dark color sediments of sand, clay and silt. These are caused by seasonal changes in a lake. Sediment layer that serves as a time marker in the rock record and results from volcanic ash or meteorite impact debris that spread out and covered large areas of Earth.

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Are the evidence of remains of once living organisms. Adaptation of life forms to changing environmental conditions. The parts that have been replaced by minerals or by recrystallization. This process is called permineralization Index fossils: Fossils that can be used by geologists to correlate rock layers over large geographic areas, or to date a particular rock layer. The four criteria are: Abundant Wide spread 4. Lived for a short period of time. When a cavity left by an organism is filled by minerals or sediments.

chapter 21 section 21.2 relative age dating of rocks

The principle of superposition 4. Which term describes when sedimentary rocks overlie non-sedimentary rocks suggesting uplift of the non-sedimentary rocks? In each diagram, which letter represents the oldest rock? There is no way to tell.

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Which of the following is not a characteristic of an Index fossils? Lived for a short period of time B. Substance X has a g and a half life of 20 minutes.

Ch 21 Fossils and the Rock Record - ppt download

How many grams of substance X will be left after one hour? A Little Bit of History… The history of geologic time begins with the human interest in mining.

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Interests in rock units began to flourish with commercial. The study guide and the practice test helped a ton! I think so…but I should look over my notes some more. My presentations Profile Feedback Log out. Auth with social network: Chapter 21 Fossils and Rock Record. Vocabulary Uniformitarianism- processes happening Rock and roll often written as Many early rock and roll songs dealt with issues of cars, school, dating, who had both greater relative affluence.

Prentice Hall Earth Science Chapter 3: Rocks Numerical and Relative Dating. Intrusive Igneous Rocks Read chapter 5 answer the section Notes on Geology, the Environment, and the Section Glencoe Earth Science Chapter The definition of relative dating and Radiometric dating is used to estimate the age of rocks and other objects.

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