structure of the earth / plate tectonics

Question 1

what are the 5 layers of the earth, from core to surface

Answer 1

• inner core
• outer core
• mantle
• asthenosphere
• crust

Question 2

how old is the earth

Answer 2

4.6 billion years old

Question 3

what is the 
- radius
- temperature
- composition
- state
of the inner core

Answer 3

• radius : 1200 km
• temperature : 6000 degrees c
• composition : iron and nickel
• state : solid

Question 4

what is the 
- radius
- temperature
- state
of the outer core

Answer 4

• radius : 2200 km
• temperature : 4000 -5000 degrees c
• state : liquid

Question 5

what is the 
- radius
- temperature
- composition
- state
of the mantle

Answer 5

• radius : 2900 km
• temperature : 3000 degrees c
• composition : silicates of iron / magnesium, sulphides and oxides of silica and magnesium
• state : liquid

Question 6

what is the 
- radius
- temperature
- state
of the asthenosphere

Answer 6

• radius : 600 km
• temperature : degrees c
• state : liquid

Question 7

what is the
- radius, why?
- composition, what does this cause?
of the oceanic crust

Answer 7

• radius : 6 km
  it is thinner as it is compacted by the weight of the ocean
• composition : basalt
  because it is basalt which will be dissolved when entering the asthenosphere as it is pushed down by the continental crust, this causes it to regenerate and so it is only up to 200 million years old