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WorksheetsSeafloor Spreading
Total questions: 35
Worksheet time: 29mins
Name
Class
Date
1.
Massive pieces of land that are part of the Earth's crust and upper mantle
a)
Tectonic plates
b)
Trenches
c)
Divergent boundary
d)
Continental shelves
2.
Which of the following supports the theory of seafloor spreading?
a)
Correlation of rock layers
b)
Crustal Age
c)
Magnetic Reversal
d)
Continuous Mountain Chains
3.
What causes the crust to move?
a)
convection
b)
conduction
c)
tension
d)
radiation
4.
The zone where one plate slides under another is called the
a)
Convergent zone
b)
Subduction zone
c)
Transform zone
d)
Mantle zone
5.
The entire cycle of heating occurring in the mantle is called
a)
Convection currents
b)
Compound currents
c)
heat currents
d)
subcurrents
6.
When looking at mid ocean ridges the oldest rocks are
a)
In the middle
b)
Found close to the rift zone
c)
Found far from the mid ocean ridges
7.
What 3 kinds of evidence were used to prove that the seafloor spread?
a)
Pillow lava, age of rocks, WWII shipwrecks
b)
Age of rocks, magnetic seafloor stripes, WWII ship logs
c)
Pillow Lava, magnetic seafloor stripes, age of rocks
8.
When one tectonic plate __________ under another at a convergent boundary it sinks back in the mantle.
a)
subducts
b)
falls
c)
sinks
9.
What technology was used during WWII to detect enemy submarines and produce the first map of the seafloor?
a)
Sonar
b)
Radar
c)
GPS
10.
Undersea mountain range.
a)
Rift
b)
Mid-ocean ridge
c)
seafloor spreading
d)
Continental drift
11.
Process by which new ocean lithosphere forms.
a)
Seafloor spreading
b)
Continental drift
c)
Mid-ocean ridge
d)
Rift
12.
The THICKEST sea floor is located?
a)
Closest to the mid-ocean ridge
b)
Farthest from the mid-ocean ridge
13.
The THICKEST sea floor is located?
a)
Closest to the mid-ocean ridge
b)
Farthest from the mid-ocean ridge
14.
The THICKEST sea floor is located?
a)
Closest to the mid-ocean ridge
b)
Farthest from the mid-ocean ridge
15.
Magnetic field that points south.
a)
Modern polarity
b)
Past polarity
c)
Normal polarity
d)
Reversed polarity
16.
Why were magnetic patterns found on the ocean floor puzzling?
a)
They showed alternating bands of normal and reversed polarity.
b)
No rocks were magnetic.
c)
They did not show alternating bands of normal and reversed polarity.
d)
All rocks were magnetic.
17.
The OLDEST seafloor is located?
a)
Closest to the mid-ocean ridge
b)
Farthest from the mid-ocean ridge
18.
Which ocean has the OLDEST seafloor?
a)
Pacific Ocean
b)
Atlantic Ocean
19.
The COOLEST temperature seafloor is located?
a)
Closest to the mid-ocean ridge
b)
Farthest from the mid-ocean ridge
20.
A _____ will form on the ocean floor when becomes dense and sinks back towards the manrle
a)
Earthquake
b)
Rift Zone
c)
Valley
d)
Trench
21.
What is label G
a)
Trench
b)
Mid ocean ridge
c)
abyssal plain
d)
sea mount
22.
What are Mid-Ocean Ridges?
a)
A chain of underwater waterfalls
b)
A chain of underwater volcanos
c)
A chain of underwater mountains
d)
A chain of underwater rocks
23.
True or False : Sea-floor Spreading adds new material to the ocean floor?
a)
True
b)
False
24.
What evidence helps scientists show how sea floor spreading occurs?
a)
Ocean Floor Material
b)
Magnetic Stripes
c)
Drilling Samples
d)
All of the Above
25.
What happens when Subduction occurs?
a)
Parts of the crust fall into the mantle
b)
Parts of the crust fall into the core
c)
Parts of the crust fall into space
d)
None of the Above
26.
Sea-floor spreading begins at the
a)
Deep ocean trench
b)
Mid-ocean ridge
Mid-ocean ridge
Mid-ocean ridge
c)
Continent's edge
27.
Magma, or molten material, __________ and hardens
a)
cools
b)
warms
c)
shrinks
28.
The oceanic crust is pushed aside on both sides of the
a)
Continent's edge
b)
Deep-ocean trench
c)
Mid-ocean ridge
29.
The process that happens at the deep-ocean trench is called...
a)
sea-floor spreading
b)
adding material to the ocean floor
c)
subduction
30.
The land feature that happens when there is subduction is called a...
a)
mid-ocean ridge
b)
deep-ocean trench
c)
asthenosphere
31.
New crust is always formed at the...
a)
mid-ocean ridge
b)
deep-ocean trench
c)
asthenosphere
32.
Older crust is found towards the...
a)
Mid-ocean ridge
b)
Deep-ocean trench
c)
Asthenosphere
33.
If there are MORE mid-ocean ridges than subduction zones, what happens to the ocean?
a)
It gets larger
b)
It gets smaller
c)
It sinks
34.
If there are more subduction zones than mid-ocean ridges, what happens to the ocean?
a)
It gets bigger
b)
It gets smaller
c)
It sinks and rises
35.
Which is NOT evidence of sea-floor spreading?
a)
Molten magma constantly erupting
b)
Drilling samples of rock
c)
Magnetic stripes
d)
Fossil evidence
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