WorksheetsSeafloor
Total questions: 26
Worksheet time: 18mins
Name
Class
Date
1.
What causes the crust to move?
a)
convection
b)
conduction
c)
tension
d)
radiation
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.
The OLDEST seafloor is located?
a)
Closest to the mid-ocean ridge
b)
Farthest from the mid-ocean ridge
4.
Which ocean has the OLDEST seafloor?
a)
Pacific Ocean
b)
Atlantic Ocean
5.
The THICKEST sea floor is located?
a)
Closest to the mid-ocean ridge
b)
Farthest from the mid-ocean ridge
6.
True or False : Sea-floor Spreading adds new material to the ocean floor?
a)
True
b)
False
7.
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
8.
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
9.
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
10.
When one tectonic plate __________ under another at a convergent boundary it sinks back in the mantle.
a)
subducts
b)
falls
c)
sinks
11.
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
12.
Magma, or molten material, __________ and hardens
a)
cools
b)
warms
c)
shrinks
13.
The oceanic crust is pushed aside on both sides of the
a)
Continent's edge
b)
Deep-ocean trench
c)
Mid-ocean ridge
14.
The process that happens at the deep-ocean trench is called...
a)
sea-floor spreading
b)
adding material to the ocean floor
c)
subduction
15.
The land feature that happens when there is subduction is called a...
a)
mid-ocean ridge
b)
deep-ocean trench
c)
asthenosphere
16.
New crust is always formed at the...
a)
mid-ocean ridge
b)
deep-ocean trench
c)
asthenosphere
17.
Older crust is found towards the...
a)
Mid-ocean ridge
b)
Deep-ocean trench
c)
Asthenosphere
18.
Which is NOT evidence of sea-floor spreading?
a)
Molten magma constantly erupting
b)
Drilling samples of rock
c)
Magnetic stripes
d)
Fossil evidence
19.
Sea-floor spreading begins at the
a)
Deep ocean trench
b)
Mid-ocean ridge
Mid-ocean ridge
Mid-ocean ridge
c)
Continent's edge
20.
Process by which new ocean lithosphere forms.
a)
Seafloor spreading
b)
Continental drift
c)
Mid-ocean ridge
d)
Rift
21.
Undersea mountain range.
a)
Rift
b)
Mid-ocean ridge
c)
seafloor spreading
d)
Continental drift
22.
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.
23.
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
24.
The zone where one plate slides under another is called the
a)
Convergent zone
b)
Subduction zone
c)
Transform zone
d)
Mantle zone
25.
The entire cycle of heating occurring in the mantle is called
a)
Convection currents
b)
Compound currents
c)
heat currents
d)
subcurrents
26.
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
100 %
