primary and secondary hazards of tectonic hazards

Question 1

primary hazards volcanoes

Answer 1

-caused directly from the volcano
- tend to have a fast speed of onset

Question 2

secondary hazards volcanoes

Answer 2

occur as a result of the heat produced by the volcano

Question 3

PH- volcanoes
Lava Flows

Answer 3

-streams of lava that have erupted onto the earths surface
-fast flowing lava can be very dangerous which depends on the lavas viscosity (the explosivity and viscosity depends on silicon dioxide content)

Question 4

PH- volcanoes
Pyroclastic Flows

Answer 4

-this is a mixture of hot dense rock, lava, ash and gas which move very quickly along the surface of the earth.
-Due to their high speeds, pyroclastic flows are extremely dangerous and can cause asphyxiation for anyone unfortunately caught by the flow

Question 5

PH- volcanoes
Tephra and Ash Flows

Answer 5

-When pieces of volcanic rock and ash are blasted into the
air.
-This can cause serious damage to buildings, which can collapse under the
weight of ash or tephra.

Question 6

PH volcanoes
Volcanic Gases

Answer 6

-Gases like Sulphur dioxide and carbon monoxide are released
into the atmosphere.
-Due to their potency, volcanic gases can travel long distances.

Question 7

SH volcanoes
Lahars

Answer 7

-Combination of rock, mud and water which travel quickly down the sides
of volcanoes.
-These can occur when the heat of the eruption causes snow and ice to
melt or alternatively when an eruption coincides with heavy rainfall.

Question 8

SH volcanoes
Jokulhlaup

Answer 8

– Snow and ice in glaciers melt after an eruption which causes sudden
floods that are very dangerous

Question 9

SH volcanoes
Acid rain

Answer 9

-caused when gases such as sulfur dioxide are released into the
atmosphere.

Question 10

DEGGS Model

Answer 10

• if a natural hazard happens in an area with a vulnerable community it can be classed as a disaster as the effects are worse compared to a prepared and equipped community.