Test 6

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In the early part of the 20th century, ____________ argued forcefully for continental drift

Alfred Wegener

The continental drift hypothesis was rejected primarily because Alfred Wegener could not __________.

identify a mechanism capable of moving continents.

All of the following are evidence supporting the theory of plate tectonics except for _____.

Changes in the moon’s orbits due to shifting plates

____________ was an ancient reptile that lived in South America and Africa during the late Paleozoic.


Linear, magnetic patterns associated with mid-ocean ridges are configured as ____________.

normal and reversed magnetized strips roughly parallel to the ridge

____________ most effectively outline the edges of the lithospheric plates

Lines of earthquake epicenters

The surface manifestation of the activity of a mantle plume is known as a ______

hot spot

Which of the following energy sources is thought to drive the lateral motions of Earth’s lithospheric plates?

export of heat from deep in the mantle to the top of the asthenosphere

Deep-oceanic trenches are most abundant around the rim of the ____________ ocean basin.


continental rift zones are generally associated with a __________ plate boundary


A typical rate of seafloor spreading in the Atlantic Ocean is ____________.

2 centimeters per year

The volcanoes and deep valleys of east Africa are related to a ____________.

Continental rift along which parts of the African continent are beginning to slowly separate

The modern-day Red Sea is explained by plate tectonics theory because it is ____________.

a rift zone that may eventually open into a major ocean if Arabia and Africa continue to separate

New oceanic crust and lithosphere are formed at ____________

divergent boundaries by submarine eruptions and intrusions of basaltic magma

Deep ocean trenches are the surface manifestations of ____

sinking of oceanic lithosphere into the mantle at a subduction zone

The ____________ is an example of an active, continent-continent collision?

northward movement of India into Eurasia

Cooler, older, oceanic lithosphere sinks into the mantle at ______

subduction zones along convergent plate boundaries

The Aleutian Islands occur at a ___________

convergent boundary on a volcanic arc above a northward-subducting Pacific plate

A transform plate boundary is characterized by ________

a deep, vertical fault along which two plates slide past one another in opposite directions

Which one of the following most accurately describes the volcanoes of the Hawaiian Islands?

shield volcanoes fed by a long-lived hot spot below the Pacific lithospheric plate

a.Oceanic ridge b. seafloor spreading c.Arc volcanoes D.divergent

Arc Valcanoes

a. Hawaii b. island arc c. volcanic arc d. subduction


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