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WorksheetsSea Floor Spreading
Total questions: 20
Worksheet time: 22mins
Oceanic crust near the mid-ocean ridge is younger than oceanic crust farther away from the ridge.
true
false
Most geologists think that the movement of Earth's plates is caused by __________________.
conduction
earthquakes
convection currents in the mantle
Earth's magnetic field
How is it possible for new crust to be formed without increasing the surface area of the Earth?
Crust is destroyed at the same time it is created
New crust is underwater where it sinks
New crust breaks more easily than old crust
What type of event will occur at this boundary?
Earthquake
Volcano Eruption
Tornado
Mountain Building
Where do volcanoes most commonly form?
Along the equator.
In Earth's polar regions.
In the middle of tectonic plates.
Near tectonic plate boundaries.
What does the theory of Continental Drift explain?
Ocean currents move continents around the planet
Convection works deep within the asthenosphere
Mid-ocean ridges force tectonic plates to move
Continents were once together and slowly drifted to where they are today
Where does seafloor spreading take place?
Convergent boundaries
The continentals shelves
Transform boundary
Mid-ocean ridges
Observe this diagram of a plate boundary. One statement BEST describes what is happening. It is that
the oceanic crust is melting.
the denser ceanic crust is subducting under the less dense oceanic crust
volcanic islands are forming.
the tectonic plates are moving away from each other.
Look at this image. Which explanation best summarizes the hypothesis shown in the figure?
The present continents will gradually move to form a single landmass called Pangaea.
The continents were once a large landmass name Pangaea, which broke apart and gradually drifted to the present-day locations of the continents.
The continents were once a large landmass, but the north and south magnetic poles pulled the continents apart toward the poles
The continents were once a large landmass, but the ocean levels rose, and these oceans separate today's continents.
You calculated the density of an unknown substance to be 7.8g/cm3. According to the chart, which of the substances doe you most likely have?
Zinc
Copper
Tin
Iron
A
B
C
D
