volcanoes and earthquakes Flashcards
1
Q
high viscosity
A
thick lava
2
Q
low viscosity
A
runny lava
3
Q
if a volcano is extinct =
A
no longer erupts
4
Q
if a volcano is dormant =
A
volcanic activity but hasnt erupted in past 2000 years
5
Q
if a volcano is active =
A
lots of volcanic activity, erupted recently
6
Q
epicentre =
A
place on surface directly above focus
7
Q
focus =
A
where the earthquake starts
8
Q
seismic/shock waves =
A
radiate outwards
9
Q
richer scale
A
uses seismograph, measures energy released
10
Q
Mercalli scale
A
uses roman numbers, measures what people feel
11
Q
moment magnitude scale
A
measures rock movement or size of crack
12
Q
why do earthquakes kill so many people
A
- hard to predict 2. people too poor to protect themselves 3. unable to enforce building saftey codes, resources and training
13
Q
why didnt japan suffer as badly with its earthquake
A
- fires put out quickly 2. helicopters used 3. hospitals put on red alert 3.100 billion spent on repair 4. electricity and gas back on within 24 hours
14
Q
what are the four layers that make up the planet
A
- plates 2. core 3. mantle 4. crust
15
Q
what are the two cores
A
outer , inner
