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Physical science > 25.3 & 25.4 > Flashcards

25.3 & 25.4 Flashcards

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Biology 101 flashcards
1
Q

what is the boundary that marks the density change between layers?

A

discontintunity

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2
Q

how are discontintunity identified

A

using sizemicwaves

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3
Q

what are shadow zones

A

aries where no sizemicwaves are recording

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4
Q

another tearm for shadow zones

A

dead zone

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5
Q

between what degrees do shadow zones fall

A

105- 140 degrees

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6
Q

Is the outer core a liquid or a solid?

A

liquid

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7
Q

is the inner core a solid or a liquid? why

A

solid because of preacher.

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8
Q

what make up the lithosphere?

A

the crust and uppermost mantle.

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9
Q

what is the asthenosphere.

A

a plastic like layer witch Earths plates move.

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10
Q

what elements make up the mantle?

A

calcium aluminum lron magnesiem

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11
Q

the measure of a fluid’s resistance to flow

A

viscosity

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12
Q

the chemical compound silicon dioxide , SO2, conman in most magma

A

silica

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13
Q

volcano that are small, have highs in hundreds of meter ranges, short eruption cycle.

A

cinder cone

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14
Q

volcano that are broad, flat structures composed of layers upon layers of lava flow.

A

shield

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15
Q

volcanoes with large and steep-sided, often thousands of meters and tens of milometers across.

A

composite

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16
Q

how do volcanoes form

A

Molten, or liquid, rocks Magma is less dense than surrounding rock, causing it to rise.

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17
Q

why dose the magma reach earths surface

A

pressure conditions allow magma to move

18
Q

why do volcano acre at plate boundaries.

A

eruptions occur where plates separate along a mid-ocean ridge or where plates collide along a subduction zone.

19
Q

where are the most volcanic activity occur

A

along plate boundaries that surround the Pacific Ocean called the Ring of Fire.

20
Q

why do they form here

A

because tectonic plates collide along subduction zones.

21
Q

why do divergent volcanoes go unnoticed

A

because it occurs under water along mid-ocean ridges

22
Q

can divergent volcanoes occur on land

A

volcanic activity occurs on land due to divergence, such as the East African Rift Valley.

23
Q

what are hot spots

A

areas of volcanic activity where magma moves toward the surface in large, balloon like plumes

24
Q

where are they hypothesized to originate

A

plumes originate near the core-mantle boundary

25
Q

what is a reason the type of eruptions differ

A

Viscosity

26
Q

why dose Lavas can vary considerably in composition

A

Silica

27
Q

what is classified as pyroclastic material.

A

volcano

28
Q

what is the smallest piroclastic materiel

A

ash

29
Q

what are the largest pyroclastic materials.

A

blocks and bombs

30
Q

what gases are expelled

A

gases, water vapor, carbon dioxide, and sulfur dioxide.

31
Q

what is molten or liquid rock stored inside earth

A

magma

32
Q

where is the ring of fire located

A

pacific ocean

33
Q

what are 2 specific locations where volcanic activities occur do to divergent plate boundaries?

A

east African rift valley

Mid Atlantic ridge

34
Q

are hot spots stationary

A

yes

35
Q

if magma has a high viscosity will it have more or less silica?

A

more

36
Q

what is pyroclastic material

A

any solid material that erupts from a volcano.

37
Q

what is the smalls type of pyroclastic.

A

ash

38
Q

What is the largest pyroclastic.

A

blocks and bombs

39
Q

what are are the types of gases that erupt from a volcano

A

water vapor carbon dioxide surfer dioxide

40
Q

how are volcanoes classified.

A

Size
Shape
materials that erupt

41
Q

what are the 3 types of volcano

A

cinder cone
shield
composite

Physical science (8 decks)

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