Ch 7

Where are tectonic plates located

At earths surface

Name the correct order of rifting events

Crystal upward , Rift Valley , linear Sean, ocean

Which plates boundary is not associated with volcanic eruption

Transform

Why are volcanoes not found at transform boundaries

Transform boundaries do not cause change to the pressure temperature or composition of the mantle

When do new oceans form

When a continent is broken apart by a divergent boundary

What causes melting of material under divergent plate boundaries

Decompression of rock

What are the three types of plates boundaries

Divergent convergent and transform

What kind of plate motion is associated with the mountain range that goes around the world what is its name

Divergent motion and mid ocean ridge

How does the lithosphere differ from the asenthosphere

The lithosphere is tends to break while the asthenosphere flows, the lithosphere overlies the asthenosphere

The East African rift is a divergent plate boundary that is splitting the continent of African into two pieces what will eventually form around this divergent boundary

An ocean

Where are most modern divergent plate boundaries found

At mid ocean ridges

What sequence of rocks would you expect Rift Valley evolution to produce from oldest to youngest

Volcanic rocks, clastic sedimentary rocks, deep sea sedimentary rocks

What surface feature provides evidence for the location of hot spots

Volcanoes with tectonic plates

In general where do volcanoes form in subduction zones

On the overriding plate away form the convergent boundary

Oceanic lithosphere contains oceanic crust and the

Outermost part of the mantle beneath the oceanic crust

How do plates move at divergent plates boundaries

Plates move apart

How do plates moves at convergent plate boundaries

Plates moves towards one another

Where would you expect to see deep ocean trenches

Oceanic oceanic convergent boundaries

Why are volcanic chains associated with convergent boundaries plates

Partial melting occurs due to subduction

What are two differences between oceanic crust and continental crust

The continental crust is thicker and less dense than oceanic crust

Which of the following statements is a part of the continental drift hypothesis

The continents of Pugh America and Africa for together like pieces of a puzzle , a single super continent consisting of all earths masses once existed

What is the relationship between the mantle and the lithosphere

Some of the mantle is contained within a smaller layer called the lithosphere

Which of the following process drive plates tectonic

Subduction and convection

How do plates move at transform plates boundaries

Plates slide past one another

Why are oceanic ridges more elevated than the rest of the sea floor

Ridges are elevated because the rocks are hot

Which fault in Southern California was created by the sliding of the pacific plate past the North American plate

San Andreas fault

Why were North American geologist so resistant to wegeners idea

Scientists demanded an explanation on how it worked as

What is convention

A cycle of moving material formed by the rise of less dense material and sinking of denser material

Where does the lithospheric form

A divergent plate boundary

What surface feature would you expect to form if both a hot spot and tectonic plate are stationary

A single volcano

What is a plume

A zone of upwelling material originating at the outer core mantle boundary

Which feature connects the South American parana and African entedeka flood basalts

Sea mount chains

What is the relationship between the crust and the lithosphere

All of the crust is contained within a larger layer called the lithosphere

What is the relationship between the mantle and the asthenosphere

All the asthenosphere is contained within a larger layer called the mantle

Which type of tectonic boundary is the result of two tectonic plates colliding with each other

Convergent boundary

Which of the following statements about earthquakes with magnitude greater the 4.0 is most accurate

Earthquakes with magnitude greater that 4.0 occur in a pattern than correlates with plate boundaries

Which of the following locations is a modern day example of an active rift

East Africa and the Red Sea

What accounts for most tectonic plate motion

Forces at subduction zones

What features at the surface provide evidence of plumes

Hot spots

At a subduction zone where oceanic lithosphere meets continental lithosphere which would subduction and why

The oceanic lithosphere would subduct because it has a higher density at 3.0 grams

Where do most divergent boundaries originate

Within continents

What is a hot spot

An area of volcanism by a mantle

In a collision between two continental plates can a continental plate subduct why or why not

Continental plates are too buoyant to subduct

In general where do earthquakes and volcanic eruption occurs

Convergent plates boundaries and divergent plates boundaries

The gulf of Aden represents which part of the rifting sequence

Linear sea

Which of the following is a layer of the earth that is classified not by composition but by physical properties

Asthenosphere

Which type of plate boundary is most closely associated with uplifting continental regions and mountains building

Convergent boundaries

Which of the following terms best characterizes upwelling in the asthenosphere

Diffuse

Which phenomenon can explain the presence of volcanoes in the middle of the Pacific Ocean

Hot spots

What is the relationship between temperature and density

In general warmer materials are less dense and colder material are denser

What happens to the lithosphere at transform plate boundaries

Lithosphere is neither destroyed nor created simply maintained or conserved

How is the thickness of the lithosphere going to change as it moves away from a divergent plate boundary

Lithosphere will thicken as more mantle is added

What forms at divergent plates boundaries

New oceanic lithosphere

Which type of faulting is associated with the development of new ocean floor

Normal faulting

What is the main material being subducted at an ocean continent convergent boundary

Oceanic lithosphere

Which of the following features is considered a destructive plate margin

Subduction zone

How are transform boundaries different from the other two types of plate boundaries

Tectonic plates slide past each other

Which type of tectonic boundary is the result of two tectonic plates sliding past each other

Transform boundary

When will a hot spots volcano become extinct

When the volcano is carried away from the hot spot by the tectonic plates