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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.The lithosphere consists of:
The astenosphere and the oceanic crust together
The mantle and the continental crust
The Earth's crust and the upper mantle
The core and the crust together

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

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

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

8.What is Pangaea?
It is the name of an extinct volcano.
It is French word for volcano.
It is a single landmass whereby all the continents of present day are joined together.
It is a huge disruption of the Earth's atmospheric circulation.

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.The process subduction does not include
Plates move towards each other.
The thinner, less dense plate will slide under the denser plate.
The subducted plate melts to produce magma.
Magma rises through fractures in the crust and reaches the surface to form volcanoes.