Ch. 6 Plate Tectonics Question Preview (ID: 35100)


Test Review For Plate Tectonics, Continental Drift, Sea-floor Spreading, Subduction, Pangaea, Etc. TEACHERS: click here for quick copy question ID numbers.

According to Wegener's hypothesis of continental drift,
a) Earth's surface is made up of seven major landmasses.
b) the continents do not move.
c) Earth is slowly cooling and shrinking.
d) the continents were once joined together in a single landmass.

What is Pangaea?
a) the name of a German scientist.
b) the name of the super-continent that existed millions of years ago.
c) another name for continental drift
d) the name of an ancient fossil

Any trace of an ancient organism that has been preserved in rock is called a
a) landform
b) continent
c) fossil
d) landmass

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 continents
b) along mid-ocean ridges
c) in deep-ocean trenches
d) at the north and south poles

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) closer to the mid-ocean ridge

Most geologists think that the movement of Earth's plates is caused by
a) conduction
b) earthquakes
c) convection currents in the mantle
d) Earth's magnetic field.

The geological theory that states that pieces of Earth's lithosphere are in constant, slow motion is the theory of
a) subduction
b) plate tectonics
c) deep-ocean trenches
d) sea-floor spreading

A place where two plates slip past each other, moving in opposite directions, is known as a
a) transform boundary
b) divergent boundary
c) convergent boundary
d) rift valley

A collision between two pieces of continental crust at a convergent boundary produces a
a) mid-ocean ridge
b) deep-ocean trench
c) rift valley
d) mountain range

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) by measuring how fast sea-floor spreading occurs

Wegener believed that the continents had once been joined in one landmass called ________.
a) Earth
b) Eurasia
c) Pangaea
d) Tectonic Plates

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

A rift valley forms at a
a) convergent plate boundary
b) divergent plate boundary
c) transform boundary
d) deep-ocean trench

The place where two plates come together is known as a
a) transform boundary
b) divergent boundary
c) convergent boundary
d) rift valley

If subduction occurs faster than oceanic crust can be created, an ocean will
a) expand
b) shrink
c) stay the same
d) never change

Oceanic crust near the mid-ocean ridge is ___________ than oceanic crust farther away from the ridge.
a) younger
b) older
c) the same
d) harder

The hypothesis of _______________ was that all the continents once were joined as a single supercontinent and have since drifted apart.
a) Pangaea
b) continental drift
c) plate tectonics
d) convection currents

The process of __________________ continually adds new crust to the ocean floor along both sides of the mid-ocean ridge.
a) subduction
b) deep-ocean trench
c) sea-floor spreading
d) rift valley

The lithosphere is broken into sections called ________________, which float on top of the asthenosphere.
a) crust
b) continents
c) oceans
d) plates

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