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Flashcards in L2 Restless Earth Deck (20)
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1

What are the Earth's 4 concentric layers?

Inner core, Outer core, Mantle, Crust

2

What is the Earth's crust broken up into?

Tectonic plates

3

What are convection currents in the Mantle caused by?

Heat rising and falling generated by radioactive decay in the core, which causes the plates to move

4

What happens at a Destructive plate boundary?

The two plates collide and one plate flows beneath the other- subduction. Earthquakes and volcanoes occur here.

5

What happens at a Constructive plate boundary?

Rising convection currents pull the crust apart forming a volcanic ridge

6

What happens at a Conservative plate boundary?

Two plates slide past each other. Earthquakes occur here.

7

What happens during a collision?

Two continental plates collide and the two plates buckle. Many Earthquakes occur here.

8

What are the characteristics of a Shield Volcano?

- Found on Constructive plate boundaries
- Formed by eruptions of thin, runny lava which flows a long way before it solidifies
- Have gentle sloping sides and a wide base

9

What are the characteristics of a Composite Volcano?

- Found on Destructive plate boundaries
- Formed by eruptions of viscous, sticky lava and ash that don't flow far
- Have steep sloping sides and a narrow base

10

What are the 2 scales used to measure the magnitude of an Earthquake?

The Richter scale, The Mercalli scale

11

What happened in the Kashmir Earthquake in 2005?

- 75,000 dead
- 75,000 injured
- 2.8 million homeless
- Property damaged ($440 million)

12

What are the signs of a Volcano nearing eruption?

- Animals and birds moving out from an area
- An increase in gas emissions
- An increase in soil temperature
- The Volcano swelling

13

Give an example of a Conservative plate margin

Pacific plate (oceanic)
North American (continental)

14

Give an example of a Constructive plate margin

North American
Eurasian plates

15

Give an example of a Destructive plate margin

Nazca (oceanic)
South American (continental)

16

What's the name of the supercontinent?

Pangea

17

What's made of Basaltic rock, and is 5km thick on average?

Oceanic crust

18

Where can temperatures reach 5,500 degrees Celsius?

The core

19

What produces enough heat to drive the convection currents?

Radioactive decay

20

What is split into two sections: asthenosphere and the Lithosphere?

The Moho