Section 1: Tectonic Hazards

Question 1

What are the four layers of the Earth, from outer to inner layers

Answer 1

1. Crust
2. Mantle
3. Outer core
4. Inner core

Question 2

What are the two types of crust, and which is denser?

Answer 2

Continental and Oceanic, oceanic is denser.

Question 3

A) How thick is continental crust?
B) What is continental crust made of?

Answer 3

A) 30-50km
B) Granite

Question 4

A) How thick is oceanic crust?
B) What is oceanic crust made of?

Answer 4

A) 7km
B) Basalt

Question 5

How thick is the mantle and what is it denser than?

Answer 5

2900km, the Crust

Question 6

What is the difference between the upper mantle and the lower mantle?

Answer 6

Upper mantle is rigid and lower mantle is semi-molten and the zone of convection currents

Question 7

What makes up the lithosphere?

Answer 7

The crust (continental and oceanic) and upper mantle

Question 8

A) How thick is the outer core?
B) What is the outer core made of?
C) What is the outer core denser than?

Answer 8

A) 2200km
B) Molten iron and nickel
C) It is denser than the mantle and crust

Question 9

Name 3 facts about the inner core?

Answer 9

1. It is 1260km thick
2. It is made of solid iron and nickel, despite the temperatures of 6000*c, because of the immense pressure
3. It is the densest layer on earth

Question 10

How old is,
A) oceanic crust
B) continental crust

Answer 10

A) the oldest is 200 million years old, but most of it is much younger
B) some part are over 4 billion years old, with the oldest rocks found in areas like Canada, Greenland and Australia

Question 11

What are the 7 main tectonic plates?

Answer 11

North American, South American, Eurasian, African, Pacific, Antarctic, Indo-Australian
(They are approximately where each continent/ocean is)