Global Hazard Patterns 🌍

Question 1

What is the wind speed cause by an extra-tropical cyclone?

Answer 1

150kmh-1

Question 2

What latitudes do trop cyclones develop between?

Answer 2

8 & 20

Question 3

What are the 3 conditions that help to form cyclones?

Answer 3

⬆️ humidity and water vapour
⬇️ winds for ↕️ clouds
SST of 26-27 degrees

Question 4

What are the 3 hazards that cyclones create?

Answer 4

⬆️ winds
Torrential rain
Storm surges

Question 5

Why are hazard risks from depressions ⬆️ in NE EU?

Answer 5

Jet stream close
W edge of Eurasian exposed to 5000km of ocean with strong winds that have moisture
⬆️ density pop.

Question 6

What is the polar front jet stream?

Answer 6

Fast moving air that circles globe in mid-latitudes at the height of 8-10km

Question 7

What is a depression?

Answer 7

Et cyclones in mid to high latitudes

Question 8

Where do depressions form?

Answer 8

Polar front jet stream

Question 9

What hazard occurs when the average rainfall doesn’t occur for up to 3 months?

Answer 9

Drought

Question 10

Why are floodplains attractive to humans?

Answer 10

Flat land for building in valleys
River has deposited alluvium which is ideal for agriculture
Water for irrigation, industry and domestic

Question 11

What is the difference between the focus and the epicentre?

Answer 11

Focus = where earthquake forms within crust
Epicentre = point immediately above focus

Question 12

What are the vibrations that cause earthquakes?

Answer 12

Seismic waves

Question 13

How far below a volcano is the magma chamber located?

Answer 13

3-4km

Question 14

What is the lithosphere?

Answer 14

The crust and underlying rigid part of the mantle

Question 15

➡️⬅️

Answer 15

Destructive

Question 16

⬅️➡️

Answer 16

Constructive

Question 17

⬆️⬇️

Answer 17

Conservative

Question 18

Name of the zone created when 2 plates converge

Answer 18

Subduction

Question 19

How are earthquakes formed from destructive plate boundaries?

Answer 19

Friction between subducted plate and upper mantle

Question 20

How does a destructive PB cause volcanic activity?

Answer 20

Melting of subducted plate. Viscious and gaseous. Rises to surface. Breaks surface to make vocano. Expolosive

Question 21

How are volcanic eruptions caused in constructive?

Answer 21

Magma from mantle spread the crust which causes a decrease in pressure

Question 22

How are earthquakes caused by constructive?

Answer 22

Causes parallel faulting that is caused by tension the crust making shallow earthquakes. Spread along ocean floor - submarine rift valleys

Question 23

How do conservative PB cause earthquakes?

Answer 23

Slowly past each other in opposite directions with uneven movement. Plates lock, pressure builds and sudden movement causes powerful earthq.

Question 24

What is a volcanic hotspot?

Answer 24

Magma rises and pushes through tec plate. Erupts at surface. Large eruptions of basaltic lava.

Question 25

What is basaltic lava?

Answer 25

Lava made from molten basalt

Question 26

What percentage of the world lives in seismically active zones?

Answer 26

20%

Question 27

What are the 4 causes of mass movement?

Answer 27

Undercutting
Rainfall
Deforestation
Earthquakes

Question 28

What is the wind speed caused by a tropical cyclone?

Answer 28

119kmh-1