Choose the correct order of layers within the earth starting from the center.
0%
Inner core, mantle, outer core, crust
0%
Mantle, outer core, crust, inner core
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Inner core, outer core, mantle, crust
100%
Crust, mantle, outer core, inner core
Q.2.
The mantle...
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is almost entirely solid but can flow
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has an average thickness of 6km under oceans and 35km under continents
100%
is mainly liquid, iron and nickel
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is mainly solid, iron and nickel
Q.3.
The crust...
0%
is almost entirely solid but can flow
0%
has an average thickness of 6km under oceans and 35km under continents
100%
is mainly liquid, iron and nickel
0%
is mainly solid, iron and nickel
Q.4.
Alfred Wegener put forward a theory to explain the change in positions of the continents. His theory was that...
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the continents had drifted apart
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the continents had been forced apart by earthquakes
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volcanic eruptions had caused them to separate
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the shrinking crust had forced them apart
Q.5.
Why did other scientists not accept Wegener's theory at the time?
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They thought that the earth's crust was too thick
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They had no way to explain how the continents could move
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They thought the earth was expanding
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They thought that the continents moved too slowly
Q.6.
Current scientific thinking is that mountain ranges are formed...
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by the earth's crust expanding as it heats up
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by earthquakes in the mantle
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by large-scale movements in the earth's crust
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by weathering and erosion of old mountain ranges
Q.7.
It is now accepted that the interior of the earth remains hot because of...
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friction between the moving tectonic plates
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volcanic activity at the plate boundaries
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friction between the core and the mantle
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natural radioactive processes
Q.8.
The Atlantic Ocean is about 5,000km wide. It is thought that is has been widening by about 2cm per year since it first formed. How many years has it taken to reach its present width?
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1,000 million years
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250 million years
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25,000 years
0%
1,000 years
Q.9.
What causes the tectonic plates to move?
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Tidal waves
0%
Strong ocean currents
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Convection currents
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Weight of the land on top of the plate
Q.10.
There are volcanic islands in several places in the mid-Atlantic Ocean. They have probably been formed there because...
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magma has erupted until it is above sea level
0%
the tides have washed up a mound of sediment
0%
there is debris from oil drilling
0%
sediments have piled up along an oceanic ridge
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