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1.What is the Earth made of?
The crust, the mantle and the core
The skin, the pulp and the core
The plates, the magma and the core
The land, the sea and the atmosphere

2.Which of the following statement is true about the continental crust?
It is made of relatively dense rocks.
It is made of relatively light materials.
It is about 7 km thick.
It is molten.

3.Which of the following statements is false about magma?
It is a layer of molten rock.
Its temperature is about 2000 (C.
It is the same as the mantle.
It rises to the Earth's surface during an eruption.

4.Plates move due to
subduction
convection currents in the mantle
sea-floor spreading
continental drift

5.Which of the following results in the extension of plates?
sea-floor spreading
continental drift
subduction
folding

6.Which of the following is not true of sea-floor spreading?
Oceanic ridge is formed.
It is basically volcanic.
A depression called oceanic trench is formed.
The boundaries that experience this process are 'constructive'.

7.Subduction does not involve
Folding, faulting and oceanic trench.
Formation of volcanoes.
Plates moving away from each other.
A destructive plat boundary.

8.Earth's core is
low in temperature
made up of molten rock
made up of denser materials
in liquid state

9.How is the Mid-Atlantic ridge formed?
By subduction
By underwater volcano eruption
By sea-floor spreading
By tension between two plates that slides past each other

10.Subduction causes all of the following except
earthquakes
oceanic ridge
fold mountains
oceanic trench