chapter 25.3 & 25.4 Flashcards

1
Q

What is the Boundary that marks the density change between layers?

A

discountinuity

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2
Q

How are discountinuity identify?

A

identify by using seismic waves

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3
Q

What are shadow zones?

A

P-waves and S-waves

areas where no seismic waves are recorded

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4
Q

What is another name for shadow zones?

A

dead zone

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5
Q

Between what degrees do shadow zones fall?

A

105 to 140 degrees

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6
Q

Is the outer core a solid or liquid?

A

liquid

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7
Q

Is the inner core a solid or liquid?

A

solid

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8
Q

What makes up the lithosphere?

A

crust and uppermost mantle

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9
Q

What is the asherenosphere?

A

a plastic like layer which earth points move

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10
Q

what element make of the mantle

A

calcium

aluminum

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11
Q

which elements make up the

A

iron

nickle

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12
Q

measure of a fluids resistance to flow

A

vicosity

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13
Q

chemical compound silicon Si02 common ingredient in most magma

A

silica

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14
Q

tend to be small have heights in the hundreds of meters range and have short eruption cycles

A

cinder cone volcano

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15
Q

are broad flat structures composed of layer upon layer of lava flows

A

shield volcano

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16
Q

are large and steep sided often thousands of meters high and tens of kilometers across the base and composed of layers of both lava and ash

A

composite volcano

17
Q

What is molten or liquid rock stored in earth called?

18
Q

Where is the ring of fire located?

A

pacific ocean

18
Q

Where is the ring of fire located?

A

Pacific ocean

19
Q

What are two specific locations where volcanic activity occurs?

A

East African ridge

Mid-Atlantic ridge

20
Q

Are hot spots stationary?

21
Q

If magma has a high viscosity will it contain more or less silica

22
Q

What is pyroclastic material?

A

any solid material that erupts from a volcano

23
Q

What is the smallest pyroclastic material

24
What is the largest pyroclastic material?
blocks and bombs
25
What are the type of gasses the erupt from a volcano
water vapor carbon dioxide sulfur dioxide
26
How are volcanoes classified?
size shape material that erupts from them
27
What are the three type of volcanoes
cinder cone shield composite