Restless Earth

Question 1

Describe continental crust

Answer 1

Think but less dense

Question 2

How many major tectonic plates are there

Answer 2

Seven

Question 3

How do destructive plate margins move

Answer 3

Towards each other

Question 4

In detail what happens when the two plates move towards each other at a destructive margin

Answer 4

The lighter continental crust stays above but the oceanic crust goes underneath this is called a subduction zone

Question 5

What does the rising magma cause at destructive plate boundaries

Answer 5

Composite volcanoes

Question 6

Name the three land features of a destructive plate boundry

Answer 6

Fold mountains
Ocean trenches
Composite volcanoes

Question 7

Why do earthquakes occur at destructive plate boundrys

Answer 7

Because energy build up in the subduction zone which forms and earth quake when the palates suddenly jolt under the pressure

Question 8

How do constructive plate boundrys move

Answer 8

Away from each other

Question 9

What fills up the gap at a constructive plate boundry

Answer 9

Magma

Question 10

Where are constructive margins often found

Answer 10

Under the sea

Question 11

What is formed at a constructive margin

Answer 11

Shield volcanoes

Question 12

Why are islands sometimes formed at constructive margins

Answer 12

Because the shield volcanoe produces magma which solidifies above the water

Question 13

What is the name for the margin in which the plates move across from each other

Answer 13

Conservative margins

Question 14

What occurs at conservative margins

Answer 14

Earthquakes

Question 15

What is the depression in which sediment forms to start the formation of a fold mountain

Answer 15

A geosyncline

Question 16

What happens to the sediment in a geosyncline over time?

Answer 16

It turns to rock

Question 17

What happens when pressure for plate movement is put onto the rock inside a geosyncline

Answer 17

It is forced upwards

Question 18

What is the name for the tops of a fold mountain

Answer 18

Anticline

Question 19

What are the dips of a fold mountain called

Answer 19

A syncline

Question 20

Name the features of a shield volcano

5

Answer 20

Only made of lava
Gentle slopes
Wide base 
Regular eruptions 
Runny lava

Question 21

Name the features of a composite volcanoe (5)

Answer 21

Made from ash and lava
Steep slopes
Shorter based
Irregular eruptions
Viscous lava

Question 22

Where do earthquakes happen

Answer 22

At all margins

Question 23

What is the focus

Answer 23

The underground centre of the earthquake

Question 24

What is the epicentre of an earthquake

Answer 24

The point on the surface directly above the focus

Question 25

What are shock waves

Answer 25

Waves of energy that move out in all directions from the focus

Question 26

Describe the Richter scale with four points

Answer 26

Measured magnitude
Uses sismographs
They are logarithmic
Measure 1-10

Question 27

Describe the mecaralli scale in three points

Answer 27

Measured by impact on people
Measured by human judgement
Measured in Roman numerals

Question 28

Name three physical things that make an earthquake worse

Answer 28

Magnitude
Shallow focus
Ground eg sand is worse as it shakes more

Question 29

Name four human factors that increase an earthquakes severity

Answer 29

Population density
Residential area
Self built housing
Lack of response

Question 30

What could tsunamis be described as

Answer 30

The secondary effect of a earthquake at sea

Question 31

How do tsunamis happen

Answer 31

One plate is stick under another causing tension
An earthquake occurs forcing the plate upwards
Sea rises causing water to be displaced and is pushed in a direction perhaps towards land

Question 32

Describe oceanic crust

Answer 32

Thin but dense