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Earth's Geologic History Flashcards | StudBud
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Earth's Geologic History
Earth's Geologic History
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A #science quiz
Flashcards
21 cards
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Questions
21
Answers
1
What is radioactive dating used for?
To determine how old soil is.
To find the absolute age of a rock sample or fossil.
To determine the exact age of a tree.
To find the relative age of a rock sample or fossil.
2
Are rocks on the ocean floor younger or older if they are found near mid-ocean ridges? Why?
Younger because divergent boundaries allow magma to surface
Younger because convergent boundaries force magma to surface
Older because the continents diverge and will reform Pangaea
Older because the continents force the seafloor to converge
3
How old is the earth?
4.6 million years
4.6 billion years
4.6 years
a big number
4
What is the Law of Superposition?
Rocks that are older are found closer to Earth's surface
Rocks that are older are found deeper in the Earth
Rocks are divided into strata when determining age
The idea behind radiometric dating and determining absolute age
5
What is the Law of Superposition used for?
Radiometric Dating
Proving Continental Drift
Finding Absolute Age
Finding relative age
6
What is Cross-Cutting Relationships?
Mountains occur through natural events such as earthquakes
Geologic layers must abide by archaeological timelines
Any geologic inclusion must be younger than the layer
Different rock layers cannot be made of the same material
7
Precambrian is the longest time division.
True
False
8
Stratigraphy
is the study of different layers in the earth
is looking at tree rings
is looking at old rubbish tips
is another name for radio carbon dating
9
What was Alfred Wegener's hypothesis about the continents.
Mountain ranges formed when continental plates collided.
The continents were once joined together and then slowly drifted apart.
The continents rest on plates that move slowly over time.
There have always been 7 distinct continents.
10
Based on the Law of Superposition, which of these options is the youngest layer?
5
4
2
6
11
Why did some scientists reject Wegener's theory?
They came up with a different explanation
They didn't believe him
He didn't have a satisfactory explanation
His evidence wasn't true
12
What do we use index fossils for?
Absolute age
Relative dating
13
Who discovered seafloor spreading?
Albert Einstien
The Ghostbusters
Harry Wells
Harry Hess
14
Which piece of evidence would you pick as the
best
evidence that Earth has changed over time?
Fossils found on continents where they no longer live.
Species living on the same continents as their fossils.
Coastline changes from weathering, erosion, and deposition.
The shapes of the continents fit together like a puzzle.
15
We are still in the Cenozoic Era
True
False
16
In the following image locate the youngest fossil.
Trilobite
Coral
Ammonite
Fern
17
The tectonic plates move.
False
True
18
Tectonic plate movement causes
Animal migrations
Earthquakes & Volcanoes
Tornadoes
Snow Storms
19
Where does seafloor spreading occur
Rift Ridges
Mountain Ridges
None of the above
Mid-Ocean Ridges
20
Why are index fossils important?
they give us index for the fossils we already have
they are alive while being examined
the index fossils tell us ALL the history of the earth
they tell the relative ages of the rock layers
21
What is seafloor spreading?
an area of the Earth's mantle from which hot plumes rise
the formation of new areas of oceanic crust
Where the most active volcanoes lie
a mountain or hill, typically conical
