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WorksheetsOcean Floor Spreading
Total questions: 15
Worksheet time: 38mins
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.
The deepest part of the ocean; long, narrow ditches
a)
Tectonic plates
b)
Trenches
c)
Divergent boundary
d)
Continental shelves
3.
The OLDEST seafloor is located?
a)
Closest to the mid-ocean ridge
b)
Farthest from the mid-ocean ridge
4.
True or False : Sea-floor Spreading adds new material to the ocean floor?
a)
True
b)
False
5.
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
6.
The oceanic crust is pushed aside on both sides of the
a)
Continent's edge
b)
Deep-ocean trench
c)
Mid-ocean ridge
7.
New crust is always formed at the...
a)
mid-ocean ridge
b)
deep-ocean trench
c)
asthenosphere
8.
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
9.
In the Atlantic ocean, where is the youngest seafloor located?
a)
Towards the edges, near the eastern and western continents
b)
Towards the middle of the ocean
c)
Towards the north and south poles
d)
Young seafloor is located randomly throughout the ocean
10.
How do scientists figure out the age of the seafloor?
a)
They research it from ancient sea maps that trading vessels would use in the 1700s
b)
They use the moon phases and eclipses to calculate the age
c)
They use seismographs and the depth as well as location of earthquakes to calculate the age
d)
They take drill ships to many locations in the oceans and collect, then date, rock samples.
11.
True or False: The continents on the eastern (the Americas) and western (Europe, Africa) side of the Atlantic Ocean are moving closer together.
a)
True
b)
False
12.
True or False: The Pacific Ocean is shrinking
a)
True
b)
False
13.
True or False: Our continents will eventually become a supercontinent (like Pangaea) again, far in the future
a)
True
b)
False
14.
According to Wegener's hypothesis of continental drift,
a)
Earth is slowly cooling and shrinking
b)
the continents were once joined together in a single supercontinent
c)
the continents DO NOT move
d)
Earth's surface is made up of seven major landmasses
15.
In Seafloor Spreading, molten material rises from the mantle and erupts or flows out
a)
along the edges of all the continents
b)
in the deep ocean trenches
c)
along mid-ocean ridges
d)
in the north and south poles
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