Seafloor Spreading Question Preview (ID: 58497)


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The crust that sinks will be recycled back into the _________________.
a) crust
b) mantle
c) outer core
d) inner core

If oceanic crust meets ____________________________, a chain of volcanoes can form.
a) oceanic crust
b) continental crust
c) the asthenosphere
d) the mid-ocean ridge

At _______________________, the more dense oceanic crust will sink under the edge of a continent or a younger, less dense oceanic crust.
a) a mid-ocean ridge
b) an oceanic trench
c) a volcano
d) an earthquake

New oceanic crust is relatively ____________________.
a) cold
b) warm
c) heavy
d) strong

As the rock cools and moves away from the mid-ocean ridge, it becomes _________.
a) lighter
b) heavier
c) less dense
d) more dense

The ________________________ rocks are located at the mid-ocean ridge.
a) youngest
b) oldest
c) middle aged
d) heaviest

The further the distance from the mid-ocean ridge, the _________________ the rock is!
a) younger
b) older
c) heavier
d) stronger

If the seafloor is spreading, does that mean that the Earth is getting larger?
a) Yes
b) No
c) It depends on the age of the rock.
d) It depends on how strong the rock is.

The entire floor on either side of the __________________ moves away (the older strips move farther away over time) like conveyor belts.
a) ocean trench
b) lithosphere
c) mid-ocean ridge
d) plate

Molten rock flows up through a crack in the Earth’s crust and hardens into solid strips of new rock on _________ of the crack.
a) the right side
b) the left side
c) both sides
d) the middle

The edges of __________________ seem to mirror the edges of the continents.
a) Ocean Trenches
b) Mid-ocean ridges
c) Plates
d) Mountains

An undersea valley that is the deepest part of the ocean is called
a) Mid-ocean Ridge
b) Ocean Trench
c) Seafloor Spreading
d) Subduction

The process by which oceanic crust sinks back into the mantle at an ocean trench is called
a) Subduction
b) Seafloor Spreading
c) Plate Tectonics
d) Continental Drift

The process by which molten material adds new oceanic crust to the ocean floor is called
a) Continental Drift
b) Plate Tectonics
c) Subduction
d) Seafloor Spreading

Chains of undersea mountains are called
a) Lithosphere
b) Ocean Trenches
c) Mid-Ocean Ridges
d) Mantle

The study of Earth's oceans is called
a) Geology
b) Oceanography
c) Aqualogy
d) Continental Drift

Large pieces of the lithosphere are called
a) Plates
b) Asthenosphere
c) Convection Currents
d) Mid-Ocean Ridges

If oceanic crust meets___________________, it can produce a chain of volcanic islands.
a) oceanic crust
b) continental crust
c) the asthenosphere
d) the mid-ocean ridge

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