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Science Chapter 10- lesson 2- relative age dating
Terms in this set (23)
age of rocks and geologic features compared to other rocks and features nearby
The relative age of lower layers of rock is ______ than the relative age of rocks above them.
The higher the layer of rock the ______________ the ______________ age is.
Principle of superposition states:
in undisturbed rock layers- the oldest rocks are at the bottom.
The principle of horizontality states:
most rock forming material was deposited in horizontal layers
principle of original horizontally:
even though rocks can be tilted or folded through time the original state of the rocks was positioned horizontally
The principle of relative- age dating states:
sediments are deposited in large, continuous sheets in all lateral directions
A piece of an old rock that becomes part of a new rock is called:
The rock containing pieces of other rocks must be ______________________ than the pieces
magma intrudes into rock layers forming a _______________. The dike contains inclusions from the rock layers. The inclusions are _______ than the dike
Sometimes rock formations ______ or fracture
when rocks break and fracture and the rocks move along a fracture the fracture is called :
Principle of cross-cutting relationships:
when geologic feature cuts across another feature, the feature it cuts across is older.
the surface between older, eroded rock and the younger rock on top of it
created when younger sedimentary layers that form on top of older, horizontal sedimentary layers that have eroded
created when young sediment layers that form on top of older horizontal sedimentary layers that have eroded
is created when young sedimentary layers that form on top of older metamorphic or igneous layers have eroded.
matching rocks and fossils from different locations
What is used to learn the relative ages of rock layers that are far a part from each other?
If 2 formations contain similar fossils, the formations are probably about the same ________________
When fossils are __________ and existed for a __________ period of time in many different areas on earth they are useful to determine relative age
Fossils the are abundant and existed a short time are called ____________ fossils
Fossils that lived on earth from hundreds to billions of years ago are not ________ because they represent time spans that are too long.
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