Ch. 10 Tectonic Plates

Which of these describes a cause of lithospheric plate movement across the surface of Earth?

• The plates are driven by bubbles from the boiling liquid of the asthenosphere.

• The plates float on dense liquid material of the asthenosphere and are moved by tidal forces.

• The plates are driven across the surface by convection currents within the plastic rock of the asthenosphere.

• The plates move because they are attached to the solid rock of the asthenosphere and move with that rock.

Two plates composed of rock of similar density meet along a convergent boundary. Which statement describes what will happen where the two plates meet?

• The plates will rub against each other, causing shearing and creating fault lines in the interior of the plates.

• The plates will collide with neither plate subducting, causing the crust to pile up and form a mountain range.

• The plates will collide, and the compression will heat the plates, causing some of the plates to melt and form volcanic mountains.

• The plates will rub against each other, causing one plate to subduct underneath the other plate and forming a deep trench along the boundary

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Heat from deep in Earth’s interior is transferred to its crust by which of the following?

• conduction in the ocean

• convection in the mantle

• radiation in the solid core

• evaporation at mid ocean ridges

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Seafloor spreading provides evidence of which of the following Earth processes?

• erosion of coastlines

• weathering of mountains

• movement of crustal plates

• formation of sedimentary rocks

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The following diagram shows the motion of two plates. Which of these explains the feature that can form at the boundary of these two plates?

• A broad canyon-like valley because the two colliding plates act like a plow, digging out any soil in the plates’ paths.

• Volcanic mountain range because one oceanic plate melts underneath the continental plate, forming composite volcanoes on the continent

• Island arc because one oceanic plate melts underneath the continental plate, forming volcanic mountains that eventually become islands

• Folded mountain range because the two colliding plates have equal composition and density, causing both to fold and form wide, thick mountains

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Which of these MOST LIKELY forms when large

sections of Earth’s crust collide with each other?

• Reefs

• Gullies

• Craters

• Mountains

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Which of these describes a divergent boundary?

• Two continental plates moving away from each other, forming a rift valley

• Two oceanic plates rubbing against each other, forming a midocean ridge

• Two continental plates colliding, forming a mountain range

• Two oceanic plates colliding, forming a volcanic arc

The San Andreas Fault is a transform fault that is located at the border of the North American Plate and the

Pacific Plate. What would MOST LIKELY form along this fault if it were a convergent fault rather than a transform fault?

• Rivers

• Mountains

• Rift valleys

• Island chains

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What process is forming high nonvolcanic mountains at location D on the map?

• One tectonic plate is splitting apart into two plates.

• Two tectonic plates are colliding and pushing together.

• One tectonic plate is sliding past another tectonic plate.

• Two tectonic plates are colliding and one is sliding under the other.

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A line of volcanoes occurs along the western coast of South America, near location O. Based on the information about plate movement on the map, which process explains the formation of these volcanoes?

• A subducting of one plate under the other causing melting of the lower plate

• sliding of one plate sideways past another resulting in friction and melting

• melting of crust because of plate movement over a “hot spot”

• rifting of a plate with lava filling in the resulting valley

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