Ch 17 Plate Tectonics

The feature marked by the letter X is a(n) _________________________.

What plate boundary causes colliding continents to crumple, fold, and form mountain ranges?

Volcanoes

The arrows in the mantle and oceanic crust indicate the direction of ____ beneath the plates.

Continental-continental plate collisions produce ____.

Theory that states that Earth’s crust and upper mantle are broken into enormous slabs

The downward part of a convection current causes a sinking force that ____.

Each cycle of spreading and intrusion of magma during seafloor spreading results in ____.

A vast, underwater mountain chain is called a(n) _________.

The process that helps to move an oceanic plate toward a subduction zone

Isochron maps of the seafloor indicate that ocean crust is ____.

What is the area that results in a chain of volcanoes along the edge of a continental plate?

How does the size of the future Atlantic Ocean compare with its present size?

_____________ is defined as the study of the history of earth’s magnetic field.

Based on the figure, what type of polarity would you expect to find in the next epoch?

Crust is neither destroyed nor formed along which of the following boundaries?

What is the term for the boundary at which two tectonic plates are moving apart?

A long, narrow, fault-bounded, continental depression is a(n) ____________________.

In which compass direction have North and South America moved in relation to Africa?

A narrow, elongated depression in the seafloor

Convection currents transfer thermal energy ____.

The features marked by the letter Y are ___________________________________.

At this type of boundary, the process of subduction causes a deep-sea trench.

rift valley

Subduction zone

A device that measures changes in Earth’s magnetic field

The magma hardens, to form a small amount of ocean floor.

How does the size of the Pacific Ocean on this map compare with its present size?

A narrow, long depression in continental crust

The existence of coal beds in Antarctica indicates that the continent once had ____.

The magnetic pattern of ocean-floor rocks on one side of an ocean ridge is ____.

Type of boundary characterized by long faults and shallow earthquakes

______________________________ are places where plates slide horizontally past each other.

Many early mapmakers thought Earth’s continents had moved based on ____.

At an oceanic-oceanic convergent boundary, ____.

____________________ is the process occurring in the area marked by the letter R.

A landmass thought to have been comprised of present-day southern continents

Highly-folded mountains

The mechanisms thought to be associated with plate movements

A narrow, elongated depression in the seafloor is called a(n) _________.

____ is a fossil fern that helped support Wegener’s hypothesis of continental drift.

Hot magma is forced toward crust along an ocean ridge.

Hot magma fills the gap that forms at the ridge