Tectonics - Part 2

Question 1

When do volcanos occur?

Answer 1

Where weaknesses in the Earth’s crust allow magma gas & water to erupt onto the land & seabed

Question 2

Where do volcanos occur?

Answer 2

Occur on the plate margins

Question 3

What are Hot Spots?

Answer 3

Are places where the crust is thin & magma maybe able to reach the surface of the earth e.g. Hawaii

Question 4

What can volcanos be?

Answer 4

1. Extinct (which have no record of tectonic activity)
2. Dormant (Volcanos that have not erupted for a long time)
3. Active (That have recently erupted)

Question 5

What are Shield Volcanos?

Answer 5

Flow for long distance

Runny and Hot lava

Question 6

What are Composite Volcanos?

Answer 6

Lava is acidic, thick, sticky and cools quickly with explosive eruptions

Question 7

What are the Five Volcanic Hazards?

Answer 7

Lava Flow
Lahars
Dust & Ash
Lava Bombs 
Pyroclastic Flow

Question 8

Describe the hazard of Lava Flow

Answer 8

• Flows down the side and quickly

Question 9

Describe the hazard of Lahars

Answer 9

• A mixture of ash and water from melted snow, travel at great speed, making evacuation difficult

Question 10

Describe the hazard of Dust & Ash

Answer 10

• Shuts out the sun, when it settles, can completely bury buildings and crops

Question 11

Describe the hazard of Lava Bombs

Answer 11

• Large pieces of Rock & Ash thrown into the air

Question 12

Describe the hazard of Pyroclastic Flow

Answer 12

• Temperature up to 1000 degrees rush down mountains scorching everything in its path