Science Reviewer Presentation #2 Ways to identify rocks Flashcards
They are formed from older rocks that have been broken down by water or wind. The older rocks become sedimentary particles such as GRAVEL, SAND and MUD.
Sedimentary Rocks
Is a method of arranging geological events based on the rock sequence.
Relative dating
Is a method that gives an actual date of the rock or period of an event.
Absolute dating
Cannot provide actual numerical dates of rocks. It only tells that one rock is older than the other but does not tell how old each of rock is.
Relative dating
States that, in any sequence of layered sedimentary rocks, the top layer is younger than the bottom layer.
The Law of Superposition
States that most sediments were originally laid down horizontally.
LAW OF ORIGINAL HORIZONTALLY
States that rock layers extend laterally or out to the sides.
LAW OF LATERAL CONTINUITY
States that fault lines and igneous rocks are younger features that cut through older features of rocks.
LAW OF CROSS-CUTTING RELATIONSHIP
Is a method used to determine the age of rocks by measuring its radioactive decay? A radioactive isotope in the rock decays into a stable daughter isotope. The decay occurs at a predictable rate, so the age of the sample could be determined.
Absolute dating or radiometric dating
For organic remains could date up to 60,000 years
Radiocarbon dating
Shows the geologic time intervals based on the geologic rock records, which describe the relationships between the events that happened throughout the Earth’s history.
The Geologic time scale
Composed of strata or layers are reviewed.
- Raw data
Volcanic rocks could date up to five billion years.
K-Ar dating and U-Pb dating
The unique succession of events in the layers is recognized based on _________ leading to a chronological order of events.
the laws of relative dating
Of the events is given using absolute dating or radiometric methods.
Numerical or absolute age
