Name: ______________________________________________________ Date: ____________ Period:_______
Restless Earth Unit Review Part 1
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Test date: Tuesday, February 25
In class work time for this review: Friday, February 21, due Monday February 24
This is an MCPS test. There is NO reassessment for this test.
There are 14 selected response questions and 1 BCR worth 6 points each on this test.
The test is worth 20 points.
Think about how the position of the continents has changed over time. What does the theory of
Continental Drift say about this? Plate are slowly moving over time
How does Pangaea support the theory of Continental Drift? The continents used to be one large
land mass and have spread apart over time.
Draw a picture of sea-floor spreading on pg. 34-35 and label the following, convergent boundary,
divergent boundary, transform boundary, subduction zone, volcanic mountains and islands, oceanic
crust, continental crust, mid-ocean ridge, rift valley, and trench.
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On the picture for question #3, draw a big “N” to represent the area of the newest oceanic crust.
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On the picture for question #3, draw a big “O” to represent the area of the oldest oceanic crust.
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What type of boundary produces seafloor spreading? Divergent
What feature is produced at a divergent boundary? Rift Valley and SFS
What earth feature does a convergent boundary between oceanic crust and continental crust create?
Subduction zone, volcano or trench
What happens to the crust at the boundary between oceanic crust and continental crust? Why? The
oceanic crust subducts (slides under) the continental crust because it is more dense.
What earth features does a convergent boundary between continental crust and continental crust
create?
Mountains
What happens to the crust at the boundary between the continental crust and continental crust of
they are the same density?
Both crust are pushed up because the density is the same
At which type of tectonic boundary are the images in each of the pictures below located?
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Transform
Convergent
Divergent
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This is a picture of a fence (
type of boundary is this?
) that splits a yard; draw the fence after the two plate move. What
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Think about heat transfer in the earth. Heat transfer in the mantle occurs by convection current
moving heat from the core to mantle and this causes plates to slowly move over time.
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On the picture above, color the plate boundaries (red) where the crust could possibly be getting
recycled in a subduction zone.
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Describe what would be forming on land around the areas you colored red.
Volcano
Describe what would be forming in the water around the areas you colored red.
Subduction zone
On the picture above, color the plate boundaries (blue) where the crust is spreading apart forming
sea-floor spreading.
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How would you describe the distance between tectonic plates?
Very close together, touching
After viewing your diagram above, describe where you would find plate boundaries:
In oceans, on continents and between both
The diagram above could be considered a model, true or false? True How about a globe? True
Using the figure on p. 10 to compete the following chart: (note: 1 mile= 1.6 km)
Layer
Crust
Mantle
Outer Core
Inner Core
Depth in km
5-70 km
2867 km
2266 km
1216 km
BCRs
BCR #1: EARTH’S INTERIOR
This diagram represents “Earth’s interior.” Geologists cannot look inside Earth. They must rely on indirect
methods of observation to identify the layers and properties of Earth’s interior.
EARTH’S INTERIOR
How are Earth’s interior layers different?
In your response, be sure to:
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compare the temperatures and densities of Earth’s major layers (core, mantle, crust)
explain how the layers interact with one another.
Earth’s Layers and how they interact:
1. List and describe properties of the 3 main layers:
a. Crust- Solid rock, 5 to 70 km thick covered in soil or water
b. Mantle very hot rock, 2,867 km thick made of 3 layers upper layer: lithosphere, makes up the
plates, next layer, asthenosphere, plasticy layer that plates float on, where heat transferred
from core to move the plates, then lower mantle, made of solid rock
c. Core – mostly iron and nickel. Two layers, liquid out layer, outer core and solid dense ball of
metal, inner core. Hottest layer
2. Explain the cause, effect, and location of convection currents:
a. Cause –Extreme heat from the core transfers to the outer layers through convection. As heat
moves through the layers it starts to lose energy, as it gets to the asthenosphere the cooler
more dense rock starts to sink back down.
b. Effect –This movement of heat cause the plates to move slowly over time
c. Location –From inner core out to the asthesophere in the mantle.