# Ch 8 Review Jeopardy Unconformi ties Half Lives Laws Relative/ Absolute Age Fossils 100 200 300 400 500.

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Ch 8 Review Jeopardy Unconformi ties Half Lives Laws Relative/ Absolute Age Fossils 100 200 300 400 500

Unconformity Home

Stratified rock over unstratified rock Answer

Nonconformity Home

Layer of sedimentary rock over an older, eroded layer of rock Answer

Disconformity Home

True or False: Unconformities determine absolute age Answer

false Home

Which law tells us that all rocks beneath an unconformity are older than rocks above the unconformity? Answer

Law of Superposition Home

Home Parent isotope

What do we use to date fossils younger than 70,000 years? Answer

Carbon-14 dating Home

In radiometric dating, scientists compare the proportion of a radioactive parent isotope to a stable: ___________ Answer

Daughter isotope Home

Method of determining the absolute age of an object by comparing the relative percentages of a radioactive and stable isotope Answer

Home. Constant

States that sedimentary rocks left undisturbed will remain in horizontal layers Answer

Principle of horizontality Home

Which law tells us that a fault or igneous intrusion is always younger than the rock layers it cuts through? Answer

The Law of Crosscutting Relationships Home

States that undisturbed sedimentary rock layer is older than the layer above it and is younger than the layers below it Answer

Law of Superpostion Home

Principle that geologic processes that occurred in the past can be explained by current geologic processes Answer

Uniformitariansim Home

Assuming a fault is younger than 2 layers its cutting through is explained by this law Answer

Crosscutting Relationships Home

Answer The numeric age of an object is called: ______

Absolute age Home

These layers are used to find absolute age and are often found in glacial lakes Answer

Varves Home

The age of an object in relation to ages of other objects Answer

Relative Age Home

Measuring the rate at which a stream erodes its bed estimates what kind of age? Answer

Home Absolute Age

Answer Arrangement of layer in which coarse and heavy particles are located in the bottom layers

True or False: bacteria can not survive freezing temperatures Answer

True! Home

Almost all fossils are discovered in what kind of rock? Answer

Sedimentary Home

Coprolite Home

Fossilized evidence of past animal movement such as tracks and foot prints Answer

Trace Fossil Home

Fossil used to date rock layers of a particular geologic age Answer

Index Fossil Home

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