Chapter 1.2

Question 1

CHECK AND UNDERSTAND WHEN GOT THIS

1. Is earthquake distribution much wider than volcanoes and Tsunami’s?
2. Why is earthquake distribution much wider than volcanoes
3. Can earthquakes occur in intra-plates, if so give an example of this

Answer 1

1.EQ distribution is much wider globally than Volcanoes and Tsunami
2. because in any plate movement direction, compressional or tension forces can be built up and be released.
3They also occur regularly intra-plate, e.g. African Rift.

Question 2

1. What occurs the most sparsely: Tsunamis, volcanoes of earthquakes?
2. What is needed for tsunamis to happen?

Answer 2

1. Tsunamis occur much more sparsely than both EQs and Volcanoes.
2. They require that a boundary is both destructive and only occur with EQ magnitudes great enough to displace the body of water above, usually 7Mw or greater. These EQs are generally rare.

Question 3

Read more on and add to these and notes Hannah’s on that1. What are less densely distributed volcanoes or earthquakes?

2. Why are volcanoes less common on intra-plates? is needed for a volcano to form?
3. What is one way volcanoes can from in the middle of a tectonic plate boundary, idk if this is the only way check.

Answer 3

1.Volcanoes are less densely distributed than EQs.
They occur more strictly on boundaries with less intra-plate distribution.
2.This is because there needs to be some kind of melting of the mantle occurring or a route for the magma to travel.
3. The exceptions to this are on hot spots due to mantle plumes e.g. Hawaii.

Question 4

Look at the structure of the earth

1. What’s the lithosphere
2. What’s the asthenosphere
3. What’s the mesosphere

Answer 4

1. The lithosphere is the outer solid part of the earth, including the crust and uppermost mantle. The top layer of the mantle is rigid.
2. The asthenosphere is the highly viscous region of the upper mantle of the Earth. It lies below the lithosphere, at depths between 100 and 200 km Convection currents found here only.
3. lower part of the mantle

Question 5

What’s the moho?

Answer 5

The Moho is the boundary between the Earth’s crust and the mantle. It is 5 to 10 kilometres below the ocean floor and 20 to 90 kilometres beneath continents.

Question 6

The Crust

1. Whats the temperature
2. Whats the density
3. Whats it made up of
4. Whats its physical state
5. What types of earthquake (seismic )waves are able to pass through
6. How thick is the crust

Answer 6

1. About 400 degrees Celsius
   2.oceanic is almost 3 grams thick
   continual crust is 2.7 g thick
   3.Granite is continental and basalt is oceanic is 2.7 grams
   4.solid
   5.surface and body waves to pass through
2. 7km to 70km thick

Question 7

look at table and learn about what the earth is made up of

Answer 7

Look at the table

Question 8

Continental crust: Continental crust:

Answer 8

• It is also known as sial. This means it has rocks rich in silicates and aluminium
• Rocks are 1500 million years old.
• 2.7g/cm3 in density