Volcanos

Question 1

What is an Active Volcano?

Answer 1

A volcano which is still erupting or has erupted in living memory.

Question 2

What is a Dormat Volcano?

Answer 2

A Volcano which hasn’t erupted in living memory but could potentially.

Question 3

Name two types of Volcanos

Answer 3

Shield and Compsite

Question 4

What is a Constructive Margin?

Answer 4

Where two plates move away from each other, new oceanic crust appears forming mid-ocean ridges with volcanos.

Question 5

What is a Destructive Margin?

Answer 5

Oceanic Crust moves towards continental crust but being densier it sinks and is destroyed, this forming deep-sea trenches and island arcs with volcanos.

Question 6

What is a Conservative Margin?

Answer 6

Two plates move sideways past each other-land is neither formed not destoryed.

Question 7

What is a collision Margin?

Answer 7

When two continental plates collide into each other forming fold mountains.

Question 8

What type of volcano is found at a destrcutive margin?

Answer 8

Compsite

Question 9

What type of volcano is found at a collision margin?

Answer 9

No Volcanic Activity

Question 10

What type of volcano is found at a constructive margin?

Answer 10

Shield

Question 11

What type of volcano is found at a conservative margin

Answer 11

No Volcanic Activity

Question 12

What type of plate margin is the Nazca and Juan De Fuca plates.

Answer 12

Destructive

Question 13

What type of plate margin is the indo-australian and Eurasian plate e.g himalayas

Answer 13

Collision

Question 14

What type of plate margin is the pacific and north american plates e.g San Andreas, CA

Answer 14

Constructive

Question 15

What type of plate margin is the mid-atlantic rid e.g Iceland

Answer 15

Conservative

Question 16

What volcanic activity is at destructive margin?

Answer 16

Very Violent

Question 17

what volcanic activity is occurring at a constructive margin?

Answer 17

Gentle Violent Activity

Question 18

what volcanic activity is occurring at a conservative margin?

Answer 18

No Volcanic Activity

Question 19

what volcanic activity is occurring at collision zones?

Answer 19

No Volcanic Acitivty

Question 20

What is a plate?

Answer 20

A small section of the earth’s crust that floats on the mantle

Question 21

What is a plate margin?

Answer 21

The boundary between 2 plates which may be moving towards, away or sideways past each other creating volcanos, fold mountains, island arcs and earthquakes

Question 22

Describe a continental crust

Answer 22

Less Dense
Thick
Older

Question 23

Describe a oceanic crust

Answer 23

denser
thin
younger

Question 24

What forms on a destructive margin?

Answer 24

Island Arcs

violent earthquakes

Question 25

How does a Island Arc form?

Answer 25

Magma rises off the sea surface to form island arcs. Friction in the mantle increases its heat, causing lava to rise to the earth's surface

Question 26

How do violent earthquakes form?

Answer 26

A denser oceanic crust is forced under the less dense continental crust. Earthquake foci-pressure builds up as plate is destoryed, the friction is released and an earthquake is produced

Question 27

What forms on a collision zone?

Answer 27

Fold Mountains

Question 28

How are fold mountain forms?

Answer 28

2 continental crust moving towards each other

Question 29

Where are violent volcanos formed?

Answer 29

destructive margins

Question 30

What is lava?

Answer 30

Lava is molten rock rejected onto the earth's surface by volcanic activity from the magma.

Question 31

Describe acid lava

Answer 31

-viscous due to low temperatures, therefore it is sticky and does not run.

Question 32

Describe basic lava

Answer 32

-non viscous lava due to its high temperatures, therefore very runny and creates a shallow volcano.

Question 33

How is a composite volcano formed?

Answer 33

- Lava eruption - At the end of eruption some lava solidifies in the volcano's vent forming a plug-this forms a blockage consequently the next eruption is violent and produces high amounts of ash

Question 34

How is a Shield volcano formed?

Answer 34

-Basic lava is non viscous therefore when it erupts the lava runs out and produces a wide base before it solidifies.

Question 35

Why aren't there any volcanic activity on the Eurasion plate?

Answer 35

No plate boundaries meet therefore there is no subduction zone, no rising convection currents consequently no processes to produce magma.

Question 36

Example of Shield Volcano

Answer 36

Hawaii

Question 37

Example of Composite Volcano

Answer 37

Mount Ether

Question 38

Describe the shape and structure of a Composite Volcano

Answer 38

- attitude is high - narrow base - alternate layers of ash and lava, that has solidified - Eruptions alternate between lava and ash clouds - violent and non violent - Lava is less hot, containing lots of silica therefore we have viscous (sticky) lava.