Flashcards in Relative Age Deck (49)
What are two schools of thought about how old the earth is?
In the field of thought called ________ people thought that large-scale geologic features formed in catastrophic events
What two ideas did Catastophists believe about the Earth/
1. large-scale geologic features formed in catastrophic events
2. the age of Earth was measurable in human historical terms
which field of thought is accepted by much of the scientific community?
Uniformitarianism says that past and present _____ processes are similar
Uniformitarianism says that...
past and present geologic processes are similar
This field of thought says that past and present geologic processes are similar?
When we say that past and present geologic processes are similar, we mean that...
we can look at geologic processes that are occurring today and backtrack and assume that they are similar to the processes that have operated throughout earths history
Since today we don't see large-scale catastrophes occurring not the face of he earth, what can we assume?
we can assume that these did not happen in Earth's past either, rather its the thought that Earth's processes move more slowly and the earth is much much older than the span of human history
Do Earth's processes move slow of fast?
what does uniformitarianism propose?
Earth was ancient much beyond the span of human history
What is relative age?
looking at two different things and broadly comparing there ages.
Relative age is looking at two different things and _______ there ages
when determine the relative age of two different things do we find the precise number or age of them?
We determine which events happened first, second, third, etc.
the science of looking at different layers of rocks the processes that form those layers
the science of rock layers and strata-forming processes
Stratigraphy is the science of _____ layers and strata-forming ______
There are a couple different ______ developed through stratigraphy laws that help us to determine the relative age of rock layers
What does the law of original horizontality say?
sedimentary beds or strata laid in water are laid horizontally.
This law says that sedimentary beds or strata laid in water are laid horizontally.
law of original horizontality
The law of original horizontality says that sedimentary beds or strata laid in water are laid ________
when sediment is deposited at the bottom a lake, the sediment accumulates in _________ layers
The law of original horizontality applies mostly to...
If you see layer that are angled or curved, there must have been some ______ that ______ those layers from their original deposition
Under the law of original horizontality, what can we infer from observing an angled or curved sedimentary layer?
there has been some event that altered those layers from their original deposition
What does the principle of superposition state?
that in undisturbed strata or layers, younger layers are deposited above older ones.
The principle of superposition states that in undisturbed strata or layers, _______ layers are deposited above ______ ones.
which principle/law states that in undisturbed strata or layers, younger layers are deposited above older ones?
law of superposition
What does the principle of cross-cutting relationships state?
that any feature cutting through or disrupting a layer is younger than the layer itself.
What does the principle of cross cutting relationships mainly apply too?
faults and dikes