the earth's structure

Question 1

what are the 4 layers of the earth?

Answer 1

the crust
mantle
outer core
inner core

Question 2

facts about the crust

Answer 2

very thin
varies between 5km-50km
is surrounded by the atmosphere

Question 3

facts about mantle

Answer 3

it has all the properties of a solid but it can flow easily, but very slowly

• a lot of heat is produced due to radioactive decay
• flow is a convection current

Question 4

the core

Answer 4

we think it is made of iron and nickel

Question 5

what are tectonic plates

Answer 5

• they float on the mantle
• because of the mantles convection current the plates drift
• but very slowly, a few cm per year
• occasionally they move suddenly causing earthquakes.