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Geologic Time And Plate Tectonics
Test Description: Test over geologic time and plate tectonics (8th grade Missouri GLE's)
Instructions: Answer all questions to get your test result.
1) In an undisturbed geologic column, which layer contains the oldest fossils and how can you tell?
A
How should I know? Hint: This is not the correct answer.
B
The one at the top because the Law of Subduction.
C
The one at the bottom because of the Law of Superposition.
D
The one in the middle because of science.
2) What is the definition of an index fossil?
A
A fossil that you can find in every layer of a geologic column.
B
A fossil that you can find in a museum.
C
A fossil that is found in soft sediment.
D
A fossil used to determine the relative age of a rock layer. It is only found in 1 layer
3) The half-life of strontium-90 is 25 years. How old is a fossil when ¼ of its parent material remains?
A
50 years.
B
75 years.
C
12.5 years.
D
25 years.
4) In a rock column at the very bottom a seashell is found. What could you assume once was in the area?
A
A very tropical climate
B
It was were large land animals once lived.
C
A sea or ocean
D
Not enough information to tell.
5) Name 2 pieces of evidence that support the theory of continental drift.
A
Fossil evidence – fossils of same species found on different continents, Mountain ranges –mountains on different continents
B
Continents seem to fit together and hot dogs.
C
Magnetic fields change in subduction zones and
D
Rocks –ages and kinds of rocks long the edge of one continent match those rocks along another continent and trees.
6) Explain how convection currents move the tectonic plates like rafts.
A
The mantle rock heats up and rises. The mantle rock close to the surface cools and sinks. This is a convection cycle.
B
Convection currents work by physically touching the hot mantle.
C
It's a scientific mystery.
D
The plates move because it's too hot to stay in one place.
7) Which plate boundary produces mountain formation?
A
Convergent with subduction (Continental vs. oceanic crust)
B
Transform
C
Convergent (continental vs. continental crust)
D
Divergent
8) Explain how a boundary would form a mountain.
A
When two plates slide past one another.
B
When two continental plates collide called convergent.
C
When one plate move underneath another.
D
When two plate move away from each other and magma leaks up and solidifies.
9) Which plate boundary can result in a ridge formation?
A
Transform
B
Divergent
C
Convergent
D
Convergent with subduction
10) Explain how a ridge formation is formed.
A
When two plates slide past one another.
B
When two continental plates collide called convergent.
C
When one plate move underneath another.
D
The plates move apart and magma leaks up and hardens leaving behind a ridge valley.
11) Which plate boundary can result in volcanic activity?
A
Convergent with sublimation
B
Transform
C
Convergent with subduction
D
Convergent (continental vs. continental)
12) Explain how a plate boundary would cause volcanic activity.
A
The plates move apart and magma leaks up and hardens leaving behind a ridge valley.
B
When two plates slide past one another.
C
When two continental plates collide and push rock upward.
D
Plates move together, the denser oceanic crust slides underneath the continental. The crust melts into magma and pushes up.
13) Which plate boundary can cause earthquakes?
A
Convergent with subduction
B
Transform
C
Divergent
D
Convergent
14) Explain how a plate boundary can cause an earthquake?
A
By moving apart from one another.
B
By one going underneath the other.
C
By colliding into each other.
D
By sliding past one another.
15) You have a rock layer of A, B and C. A is on the top, B in the middle and C at the bottom. Describe the relative age of rock layer B.
A
Layer B is older than A and younger than C because of the Law of Superposition.
B
There is no way to tell the age of rock layers.
C
Layer B is younger than A and older than C because of the Law of Superposition.
D
Layer B is 160 year old.
*select an answer for all questions
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