Hazardous Earth

Question 1

4 reasons why people still live near tectonically active areas

Answer 1

Tourism
Spiritual Reasons
Fertile Soil
Geothermal Energy

Question 2

Plate Margin

Answer 2

The place where two tectonic plates meet

Question 3

Plate tectonics

Answer 3

A scientific theory that explains how volcanoes and earthquakes are created as a result of movements of the earths crust

Question 4

Subduction

Answer 4

When the dense oceanic plate sinks into the mantle and melts

Question 5

Name the four structures of the Earth

Answer 5

Crust
Mantle
Outer core
Inner core

Question 6

What are the differences between composite and shield volcanoes?

Answer 6

Composite volcanoes are tall and emit thick lava on the sides

Shield volcanoes are short, wide and emit thin, runny lava down the sides

Question 7

What is the difference between continental and oceanic crust?

Answer 7

Continental crust is thick (25 to 72 km), is found underneath land and cannot melt.

Oceanic crust is thin (5 to 20 km), is found underneath the ocean and can melt

Question 8

What were the primary impacts of the Boxing Day tsunami?

Answer 8

230,000 deaths
Damage to buildings and houses were destroyed

Question 9

What were the secondary impacts of the Boxing Day tsunami?

Answer 9

Many people died from diseases such as dirty water
Homelessness
Oil spills

Question 10

Describe the global distribution of earthquake and volcano hazards

Answer 10

Most volcanoes and earthquakes are found on plate margins. for example 75% of the world’s volcanoes around the Pacific plate. one anomaly is Hawaii in the middle of the Pacific plate.

Question 11

How are earthquakes formed?

Answer 11

A sudden release of pressure as the plate get stuck. We feel a violent shaking of the ground.

Question 12

Name two positive impacts of the Iceland eruption in 2010

Answer 12

There was a 240 per 6% increase in tourism rates which caused a raise of GNI in Iceland.

Fertile soil . Long grass held the ash helping crops

Question 13

Name two negative impacts of the Iceland eruption in 2010

Answer 13

Flooding from melted glaciers

Worldwide flight cancelled and at £130 million loss in the travel and tourism sector

Question 14

Name the four types of plate boundaries

Answer 14

Conservative
Constructive
Destructive subduction
Destructive collision

Question 15

How are volcanoes formed?

Answer 15

At constructive plate boundaries, the tectonic plates are moving away from one another. The Earth’s crust is pulled apart to create a new pathway for rising hot magma to flow on to the surface