L1

Question 1

What’s is the structure of the earth

Answer 1

outer core, mantle and crust. The crust is made up of tectonic plates, which are in constant motion.

Question 2

What is the crust made up of

Answer 2

The crust is made up of tectonic plates.

Question 3

How do plates move

Answer 3

The plates move because of convection currents in the Earth’s mantle. These are driven by the heat produced by the decay of radioactive elements and heat left over from the formation of the Earth.

Question 4

Where are volcanoes most likely to occur

Answer 4

Earthquakes and volcanoes are most likely to occur at plate boundaries.

Question 5

What are the two types of crust

Answer 5

▪ Continental – old, denser

▪ Oceanic – younger, less dense

Question 6

2 parts of mantle

Answer 6

Upper part is solid – like the crust; together called the lithosphere
Asthenosphere- sticky, viscous,hotter than upper

Question 7

Describe th asthenosphere

Answer 7

Rock become Heated, rises, spreads, cools, sinks back to the bottom, reheats and rise again

Question 8

What is th core made or

Answer 8

Iron and nickel

Question 9

Composition and purpose of magnetosphere

Answer 9

Outer core – liquid iron
o Works like an electric dynamic
o Producees a magnetic field
o Its invitislbe
o Protects thre Earth from hamrlful radioactiom from space