Geologic Time And Plate Tectonics: Question Preview (ID: 23293)


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