Lesson 1-Structure of the Earth

Question 1

What is the thickness of the Mantle?

Answer 1

2,900km

Question 2

What is Most of the mantle made up of?

Answer 2

Semi- molten

Question 3

What does the mantle have?

Answer 3

A temperature gradient

Question 4

Where are the highest temperatures closest to?

Answer 4

The heat producing core

Question 5

Describe the rocks in the upper mantle

Answer 5

Cooler and Brittle

Question 6

What are rocks like in the lower mantle?

Answer 6

Hot and brittle (but not molten)

Question 7

What are rocks in the lower mantle rich in?

Answer 7

Iron and magnesium

Question 8

What state is the outer core?

Answer 8

Liquid

Question 9

What does the outer core generate?

Answer 9

Magnetic field

Question 10

What percent of the outer core is made up of iron and sulphur?

Answer 10

88% iron and 12% sulphur

Question 11

What are the temperatures within the outer core?

Answer 11

4400 to 6100 degrees C

Question 12

Is the crust thick or thin?

Answer 12

Thin

Question 13

What are the rocks within the crust rich in?

Answer 13

.Silicon
.Oxygen
.Aluminium
.Potassium
.Sodium

Question 14

What is the hottest part of the Earth?

Answer 14

Inner Core

Question 15

Is the inner core solid or liquid?

Answer 15

Solid

Question 16

What is the inner core made of?

Answer 16

Iron (80%)
Nickel(20%

Question 17

What is the temperatures within the inner core?

Answer 17

6000-7000 degrees C

Question 18

Why and what causes the high temperatures within the inner core?

Answer 18

The radioactive decay of matter here

Question 19

What does heat rising and falling within the mantle create?

Answer 19

Convection Currents

Question 20

What happens to the plates when the convection currents converge?

Answer 20

Plates move towards each other