Sea-Floor Spreading: Question Preview (ID: 18617)

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The ocean floor sinks beneath a deep-ocean trench and back into the mantle in a process known as ________.
a) subduction
b) convection
c) continental drift
d) plate tectonics

Subduction occurs where the oceanic crust bends down toward the mantle at a(n) ________.
a) divergent boundary
b) deep ocean trench
c) transform boundary
d) mid-ocean ridge

Old oceanic crust is more dense than new oceanic crust because it is
a) hot
b) moving toward a deep-ocean trench
c) cool
d) conduction

The process of ___________ continually adds new crust to the ocean floor along both sides of the mid-ocean ridge.
a) convection
b) continental drift
c) plate tectonics
d) sea-floor spreading

The process by which the ocean floor sinks beneath an deep-ocean trench and back into the mantle is known as
a) convection
b) continental drift
c) subduction
d) conduction

How did scientists discover that rocks farther away from the mid-ocean ridge were older than those near it?
a) by observing eruptions of molten material on the sea floor
b) by mapping rocks on the sea floor using sonar
c) by determining the age of rock samples obtained by drilling on the sea floor
d) my measuring how fast sea-floor spreading occurs

Mid-ocean ridges are
a) found in all of Earth's oceans.
b) found only in the Pacific Ocean.
c) located mostly along coastlines
d) long deep-ocean trenches

What technology did scientists use in the mid-1900s to map the mid-ocean ridge?
a) satellites
b) deep-sea diving
c) submarines
d) sonar

In sea-floor spreading, molten material rises from the mantle and erupts
a) along the edges of all the continents
b) along mid-ocean ridges
c) in deep-ocean trenches
d) at the north and south poles

The scientist credited with sea-floor spreading is _________
a) Alfred Wegener, a German scientist
b) Harry Hess, an American geologist
c) J. Tuzo Wilson, a Canadian scientist
d) Dennis Lieding, a Libertyville social studies teacher

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