Volcanoes

Question 1

Structure of the Earth

Answer 1

Inner Core –Solid
Outer Core –Fluid Iron/Nickle
Mantle – 3000 km thick hot dense rock

Question 2

Convection currents

Answer 2

Exists in the mantle and moves heated molten material up from the core to the crust where it cools and sinks back down to the core

Question 3

Plate margins

Answer 3

The border where two tectonic plates meet and where earthquakes are very frequent

Question 4

Constructive plate margins

Answer 4

Where plates push apart moving away from each other and new crusts are created by molten rock or magma rises to fill the gap

Question 5

Destructive plate margins

Answer 5

Where oceanic crusts crash into each other destroying a plate

Question 6

Formation of rock types

Answer 6

Intrusive igneous rocks: It cools underground so cools slowly making large crystals

Extrusive igneous rock: It cools above ground so cools quickly

Sedimentary: Small particles of rock are deposited under the sea as sediment which builds up in layers

Metamorphic: Changed by either heat or pressure

Question 7

Focus vs Epicentre

Answer 7

Focus is the point in the Earth’s crust where the earthquake occurs

Epicentre is the point on the earth’s surface directly above the focus, where the effects are felt first