Duplicate of Earth/Space Science Chapter 17 Test Review

The theory of plate tectonics states that the crust/upper mantle are broken into slabs called plates that move slowly.

At an oceanic-oceanic convergent boundary, ___.

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

A magnetometer detects small changes in Earth's magnetic field.

Continental drift was not widely accepted when it was first proposed because ___.

Some early mapmakers thought that the coastline of South America matched the coastline of Asia?

The study of Earth's magnetic record is known as paleomagnetism.

A long narrow fault-bounded, continental depression is a rift valley

Compared to ocean crust near deep-sea trenches, crust near ocean ridges is ___.

Earth's continents were once joined as a single landmass called Pangaea.

Divergent occurs when one tectonic plate descends beneath another.

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

The youngest part of the ocean floor is found ___.

If two continental plates converge, a subduction zone forms.

Ridge push is a process where the weight of an uplifted ocean ridge pushes an oceanic plate toward a subduction zone

The weight of a subducting plate helps pull the lithosphere into a subduction zone in a process called slab pull.

A change in Earth's magnetic field is called a magnetic reversal

Many early mapmakers thought Earth's continents had moved based on ___.

As new seafloor moves away from an ocean ridge, the seafloor cools and becomes less dense than the material beneath it.

The transfer of thermal energy by the movement of warmed matter is called convection.

A map line connecting points that have the same age is a sameochron

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

According the theory of plate tectonics, plates interact by deflecting/moving away/moving horizontally

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

The rising part of a convection current causes upward/lateral forces that lift/split the lithosphere at divergent bound

Scientists rejected Wegner's hypothesis of continental drift because he could not explain how or why continents move

Plates come together at divergent boundaries

Wegener's hypothesis of continental drift stated that Earth's continents had once been joined as a single landmass

The driving forces of tectonic plates are related to convection currents in Earth's ____.

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

Continental-continental plate collisions produce ___.

Slab pull is a process that occurs at convergent boundaries.

Places where plates move apart are convergent boundaries.

Features found at divergent boundaries include ___.

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

Convection currents transfer thermal energy ___.

___ is a fossil fern that helped support Wegener's hypothesis of continental drift.

Subduction results in the formation of ___.

The theory of seafloor spreading explains how new ocean crust is created at ocean ridges and destroyed in trenches

The transfer of thermal energy by the movement of heated matter is conduction.