has average thickness 6km under sea & 35km under continents

Current scientific thinking is that mountain ranges are formed...

by large-scale movements in the earth's crust

Choose the correct order of layers within the earth starting from the centre.

Inner core, outer core, mantle, crust

There are volcanic islands in Atlantic Ocean. They have probably been formed there because...

magma has erupted until it is above sea level

is almost entirely solid but can flow

Alfred Wegener explained the change in positions of the continents. His theory was that...

the continents had drifted apart

Why did other scientists not accept Wegener's theory at the time?

They had no way to explain how the continents could move

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Chemistry: The Earth

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Earth, the planet we live on, is not a solid ball of rock. You need to know about the processes that make it very much our 'restless Earth'.

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Questions 10

Answers

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

Chemistry: The Earth Flashcards | StudBud