EF Volcanos

Question 1

What are the 4 layers in the earth?

Answer 1

Crust, Mantle, Outer core(liquid) and Inner core (solid)

Question 2

Which is denser:

-the oceanic crust

-the continental crust?

Answer 2

The continental crust is lighter because it sits above the Oceanic crust

Question 3

Which is thicker:

-the Oceanic

-the Continental?

Answer 3

The Continental crust is thicker with a thickness of 35km.

The Oceanic is 7km thick.

Question 4

Describe somethings about Destructive plate boundaries

Answer 4

• Move together
• The denser Oceanic crust sinks below the lighter Continental crust
• The Oceanic crust sinks below into the mantle
• it melts in the subduction zone
• may be released as an earthquake or a volcanic erupition
• The continental crust becomes crumpled into fold mountains

Question 5

Constructive plate margins….

Answer 5

• movig apart
• happens under the Ocean
• the gap left is filled with magma rising up from the mantle, below to form a volcano
• some of these have become large enough to form volcanic islands like iceland and the canary islands

Question 6

Conservative plate margins….

Answer 6

• sliding past each other in the same or oppostite directions
• sometimes called passive margins
• two plates meet at a fault and pressure builds up until 2 plates jerk past each other
• this causes earthquakes and the land at the fault becomes ridged and crumpled
• A good example is the San Andreas fault in California

Question 7

How many different plate margins are there and name them…

Answer 7

• there are 4 different plate margins
• the constructive plate margins
• the conservative plate margins
• the destructive plate margins
• the collision plate margins

Question 8

How many different plates are there and what are there names?

Answer 8

• There are 8 different ones
• The Nazca plate
• The Pacific plate
• The Northern American plate
• The Southern American plate
• The African plate
• The Antarctic plate
• The Eurasion plate
• The Indo-australian plate

Question 9

Composite and Shield Volcanoes…

Answer 9

• The composite volcano is based on the destructive plate boundary and the shield volcano is based on the constructive boundary
• the composite volcano has a narrower base than the shield volcano which has a wide base
• the composite volcano is taller and the shield volcano is short and stumpy
• shield volcano-only lava inside
• composite volcano-ash and lava
• composite-steeper slopes
• shield- gentller slopes