Volcanos πŸ‘πŸŒΏπŸŒžπŸ”₯✨πŸ₯ Flashcards Preview

Beccy geography πŸ‘βœ¨πŸπŸŒΏ > Volcanos πŸ‘πŸŒΏπŸŒžπŸ”₯✨πŸ₯ > Flashcards

Flashcards in Volcanos πŸ‘πŸŒΏπŸŒžπŸ”₯✨πŸ₯ Deck (40):
1

Where does a volcano develop ? 🌿

From an opening in the Earths surface

2

When it erupts what escapes ? πŸŒ‹

Molten rock ( magma ) in a burst of speed πŸŒ‹

3

What is a volcano ? πŸŒ‹

A natural hazard that can be very destructive but also create new land 🌿

4

What can a volcano send into the atmosphere ?

~ poisonous gases
~ millions of tonnes of dust

5

What does it cover land with ?

- molten lava
- hot ash

6

What dies hot ash do ?

Kills Plants + animals and destroys settlements

7

What is an extinct volcano ?

When a volcano is no longer active

8

What is a dormant volcano ?

A volcano that is still active but hasn't erupted in a very long time

9

Where is the largest volcano found ?

Pacific Ocean

10

What is the earth ?

A huge fiery ball of hot molten rock, surrounded by a thin layer if cool, hard rock

11

List the primary hazards of a volcano

: ash and dust
: lava flows
: Thephra
: volcanic gases

12

Secondary hazards

; mudflows
; tsunamis
; landslides
; debris avalanches

13

Other hazards ?

Affect in climate
Risk of aircraft due to dust cloud

14

Name the three types of volcanos

Rift volcano
Subductive volcano
Hot spot volcano

15

What 2 gases are let into the atmosphere ( volcanic gases )

Carbon monoxide , sulphur dioxide

16

How do volcanologists predict eruptions ?

Tremors
Earthquakes
Energy waves to work out how close magma is to the surface
Gases in the air change
The amounts of volcanic gases increase
Temperature of stagnant water gets warmer
Magma causes a bulge in the side of volcano
Movement in the ground changes shape of volcano

17

Why do scientists look at past eruptions ?

To see where the most severe lava flows, mudflows , and floods might be expected

18

How are earth tremors caused ?

Movement of tectonic plates

19

What is an earthquake measured on ?

A Richter scale

20

What does the Richter scale calculate ?

The energy released by an earthquake to determine its magnitude

21

How is it measured ?

2 is 10 times more powerful than 1 etc

22

Which cause v little damage and which cause a lot ?

Little - 5 or less
Lot - 7 and above

23

What is another way an earthquake can be measured ?

On the mercalli scale

24

How is the mercalli scale measured ?

(1) - small shudders
(12) - total destruction

25

How are buildings able to withstand earthquakes ?

> stronger reinforced foundations
> restricting their height
> wide roads between building - prevent fires
> gas and water pipes + electric cables are well protected

26

Give examples of extreme weather

Hurricanes
Tornadoes
Droughts
Floods
Freezing temp.

27

What is a tropical storm ?

Low pressured weather system where the centre is warmer than the surrounding atmosphere

28

Where do hurricanes develop and where do they lose force ?

Warm seas, lose force over land

29

What must a storm have to be classified as a hurricane ?

Wind speed - 120km/h

30

How long does it take for hurricanes to form

Over a few days // 6 - 12 hours

31

When do they form ?

When the air over the warm sea in the tropics expands and rises

32

What part of a hurricane is the calmest ?

The eye πŸ‘

33

What do hurricanes pick up ?

Huge amounts of water

34

What is a hurricane accompanied by ?

Heavy rain and lightning

35

What happens in a hurricane ?

Rain wind and waves cause a lot of damage
Strong winds cause the most damage
Huge waves kill most people
Centre - pressure is low you get a swell of water 3 m high

36

What is a tornado ?

Violent spinning column of air that stretches from a base of a thunderstorm to the ground

37

Where do they form ?

Over land where it's warm, moist air near the ground and cool dry air above it

38

What is a tornado measured on ?

Fujita scale

39

What happens in winter storms

Rain snow and hail

40

What is the worst type of winter storm ?

Blizzard ( snow storm )