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Flashcards in Tectonic Hazards Deck (30)
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1
Q

Are tectonic hazards a type of natural hazard?

A

Yes

2
Q

What is a natural hazard?

A

A naturally occurring event that has the potential to affect people’s lives or property

3
Q

Name a couple examples of natural hazards?

A

Earthquakes, tsunamis, volcanic eruptions

4
Q

The earths surface is separated into…

A

Tectonic plates

5
Q

Describe the 4 layers and the structure of the earth and what they are made out of

A
  • Inner core - solid nickel and iron
  • Outer core - liquid
  • Mantle - semi-molten rock that moves very quickly
  • Crust- very thin, divided into tectonic slabs
6
Q

What are the two types of crust?

A
  • Continental

* Oceanic

7
Q

What type of crust is thick and less dense?

A

Continental

8
Q

What crust is thin and more dense?

A

Oceanic crust

9
Q

The plates are moving because…

A

The rock in the mantle underneath them is moving

10
Q

The places where the plates meet are called the ____ or _____

A

Boundaries or plate margins

11
Q

What are the 3 types of plate margin?

A
  • Destructive
  • Constructive
  • Conservative
12
Q

The area where continental plates collide is called a …

A

Collision zone

13
Q

Destructive margins are where two plates are… explain

A

Moving towards eachother.

Where an oceanic plate meets a continental plate, the denser oceanic plate is forced down into the mantle and destroyed.

14
Q

What’s an example of a destructive margin?

A

Pacific plate is being forced under the Eurasian plate along the east coast of Japan.

15
Q

Constructive margins are where two plates are… explain

A

Moving away from eachother.

Magma (molten rock) rises from the mantle to fill the gap and cools, creating new crust.

16
Q

What’s an example of a constructive margin?

A

The Eurasian plate and the North American Plate are moving apart at the mid-Atlantic ridge

17
Q

Constructive margins are where two plates are….. explain

A

Moving sideways past eachother.

or are moving in the same direction but at different speeds. Crust isn’t created or destroyed.

18
Q

What’s an example of a conservative margin?

A

The Pacific plate is moving past the North American plate on the west coast of the USA

19
Q

What’s a fault?

A

A fracture in the earths crust that shows signs of movement

20
Q

What’s the subduction zone?

A

Area of destructive plate boundary. The plate does under another.

21
Q

Do earthquakes occur at all three plate margins?

A

Yes

22
Q

How is an earthquake caused at a destructive margin?

A

Pressure builds up when one plate gets stuck as it’s moving down past the other into the mantle

23
Q

How is an earthquake caused at a constructive margin?

A

Pressure builds up along the cracks within the plates as they move away from eachother

24
Q

How is an earthquake caused at a conservative margin?

A

Pressure builds up when plates that are grinding past eachother get stuck

25
Q

What are shock waves?

A

Vibrations that cause an earthquake

26
Q

What is the focus?

A

The point in the earth where the earthquake starts

27
Q

What is the epicentre?

A

The point on the earths surface straight above the focus

28
Q

Near the epicentre the shock waves are…

A

Stronger and cause more damage

29
Q

The amount of energy released by an earthquake (its magnitude) is measured using…

A

The Richter scale

30
Q

Are volcanoes found at all three types of plate margin?

A

No, only destructive and constructive plate margins