A subduction zone is formed...

when one tectonic plate sinks below another

at every type of convergent plate boundary

at every type of divergent plate boundary

Convection currents in the Earth's mantle are caused by

Less dense hot magma moving upward

Less dense hot magma moving downward

More dense cooler magma moving upward

What are the two layers in the Earth in which convection currents occur?

outer core and mantle (asthenosphere)

Why does it make sense that convection can occur in the asthenosphere?

The asthenosphere is a material that can flow.

The asthenosphere is solid metal.

The asthenosphere is brittle and broken.

The asthenosphere doesn't have convection in it at all.

This is the driving force behind the movement of tectonic plates.

Atmospheric convection currents

Why are the oldest parts of the ocean floor no older than about 200 million years old?

That is how long it takes for new crust to form, move across the ocean and sink into a trench

That is how long it takes for sand to completely cover the ocean floor

Underwater volcanoes erupt every 200 million years and create a new ocean floor

Which is the FIRST step of sea-floor spreading?

Molten material from inside Earth rises to the ocean floor at a mid-ocean ridge

The molten material cools and hardens, forming a strip of rock along the ocean floor

The strip of rock moves away from the ridge

Which is the SECOND step of sea-floor spreading?

The molten material cools and hardens, forming a strip of rock along the ocean floor

The strip of rock moves away from the ridge

Molten material from inside Earth rises to the ocean floor at a mid-ocean ridge

Which is the THIRD step of sea-floor spreading?

The strip of rock moves away from the ridge

The molten material cools and hardens, forming a strip of rock along the ocean floor

Molten material from inside Earth rises to the ocean floor at a mid-ocean ridge

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

Which of these events can ONLY happen on a DIVERGENT BOUNDARY ?

An Insanely complex, long answer that you will click out of instinct.

The average density of one of the continental crusts is 2.8 g/cm 3 and the average density of one of the oceanic crusts is 3.2 g/cm 3 . If these two plates came together, what could be expected to happen?

The oceanic plate would be pushed under the continental plate.

The two plates would push apart and form a rift zone.

The oceanic plate would rise up over the continental plate.

The two plates would meet head on and rise up to form mountains.

Why does the ocean floor sink beneath the continent at Z?

The ocean floor is more dense than the continent.

The ocean floor is less dense than the continent.

The ocean floor is moving faster than the continent.

The ocean floor is moving slower than the continent.

A mid- ocean ridge separates the Pacific plate and the Nazca plate off the western coast of South America. Which statement best describes the relative motions of the Pacific and Nazca plates?

The Pacific plate is moving to the west, and the Nazca plate is moving to the east.

The Pacific and Nazca plates are moth moving to the east.

The Pacific and Nazca plates are both moving to the west

The Pacific plate is moving to the east, and the Nazca plate is moving to the west.

The image shows a plate boundary. Arrows have been added to indicate the movement of the plates.What plate boundary feature is also shown?

A fault forming at an active transform boundary

A ridge formed by an inactive convergent boundary

A valley forming at an active divergent boundary

A volcano formed by an active transform boundary

The map shows the locations of four active volcanoes in the Caribbean Sea. What do these volcanoes indicate about plate tectonics in the region?

The volcanoes form an island arc, indicating a converging plate boundary

The volcanoes form a line, indicating a diverging plate boundary.

Two plates are moving past each other, causing faulting and magma formation.

Two plates are moving apart, creating new seafloor

Plate Tectonic

Authored by Jimmy SIN SIN

Geography

9th Grade

Used 1+ times

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48 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The completely liquid layer of Earth is called the...

outer core

inner core

mantle

crust

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the cause of all crustal activity?

magnetic-pole reversals

faults in mountain ranges

energy from the sun

convection current in the mantle

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What kind of plate boundary is shown here?

divergent

convergent

transform

subducting

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What kind of plate boundary is shown here?

divergent

convergent

transform

submergent

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What kind of plate boundary is shown here?

divergent

convergent

transform

strike slip

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What geologic feature/event you be most likely to find at a transform boundary?

Earthquakes

Volcanoes

Mountains

Rift Valleys

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What geologic feature/event would you most likely to find at a divergent boundary between two pieces of oceanic crust?

Rift Valley

Mid-Ocean Ridge

Island Arc

Flat land

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Plate Tectonic

The completely liquid layer of Earth is called the...

What is the cause of all crustal activity?

What kind of plate boundary is shown here?

What kind of plate boundary is shown here?

What kind of plate boundary is shown here?

What geologic feature/event you be most likely to find at a transform boundary?

What geologic feature/event would you most likely to find at a divergent boundary between two pieces of oceanic crust?

What geologic feature/event would you most likely to find at a divergent boundary between two pieces of continental crust?

A subduction zone is formed...

Convection currents in the Earth's mantle are caused by

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