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Plate tectonics Flashcards | StudBud
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Plate tectonics
Plate tectonics
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#structureoftheearth #platetheory
Flashcards
21 cards
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Questions
21
Answers
1
Choose the three correct statements. The Earth's crust is..
The thinnest layer of the Earth.
The layer upon we live.
The hottest layer of the Earth.
Solid and broken up into giant slabs of rock called 'tectonic plates'
2
Alfred Wegener proposed his theory of 'continental drift' in 1912...
False
True
3
'As you go from the Mid-Atlantic Ridge towards the edges of the plate, the age of the oceanic crust increases...'
True
False
4
Which layer of the earth is made up of iron and nickel with temperatures of up to 6000°C?
Outer Core
Mantle
Continental Crust
Inner Core
5
Which is older- 'Continental crust or Oceanic crust'?
Oceanic
Continental
They are the same age
6
Convection currents are...
Currents caused by the core cooling the semi-molten rock in the mantle.
Currents in the Earth's crust that cause the tectonic plates to move.
Currents in the Earth’s mantle which rise from the Earth’s core.
Currents in the Earth’s mantle which descend from the Earth’s crust.
7
Which is denser- 'Continental crust or Oceanic crust'?
Oceanic
They are the same density
Continental
8
What did people once think the oceans and continents were formed from?
The shrinking of Pangaea
Expansion after the Earth warmed up after formation
Shrinkage after the Earth cooled down long after forming
Big Bang!
9
Where is the outer-most layer thickest?
Middle of the Atlantic Ocean
Himalayas mountain range in Asia
Andes mountain range in South America
Middle of the Pacific Ocean
10
What are the two types of crust?
Continental and Land
Countries and Oceanic
Continental and Oceanic
Sea and Land
11
A plate boundary is..
The edge of a tectonic plate.
Large pieces or 'slabs' of rock that form the Earth's crust
Where two plates meet
The middle of a tectonic plate
12
What do scientists call the super-continent that was around 220 million years ago?
Laurasia
Gondwanaland
Pangaea
Europa
13
The mantle is made of semi-molten rock. This means that it is...
Liquid all the way through.
Solid all the way through.
It is between a solid and a liquid.
14
'As you move from the outermost layer of the Earth towards the centre, the temperature decreases'
True
False
15
The Earth's crust is..
The solid layer at the centre of the Earth.
Broken into large pieces of solid rock called tectonic plates.
One big piece of solid rock that forms the outermost layer of the Earth
16
Slab pull happens where the magma starts to fall back down & the heavy oceanic plate plunges down into the mantle.
False
True
17
'There was an acceptance of Wegener's continental drift theory in 1912...'
False
True
18
Convection currents cause the tectonic plates to move because...
The magma is thin and runny & so sticks to the bottom of the tectonic plate
The magma is thick and viscous & so sticks to the bottom of the plate
19
The Earth has...
3 layers
2 layers
4 layers
5 layers
20
As the rock in the lower mantle heats up and melts it expands which means that...
It stays the same density and so does not rise or fall.
It becomes denser (heavier) so it falls.
It becomes less dense (lighter) so it rises.
21
Which of the following was not given as evidence for continental drift in 1912?
Mesosauras fossil found across Africa and South America
Age of Oceanic crust in the Mid-Atlantic Ridge
Glossopteris fossil found across several continents
Jigsaw fit of continents such as Africa and South America
