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Igneous Rock
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Why are igneous rocks usually hard?
 
Their crystals are tightly packed
 
They are made of soil
 
They contain air spaces
Which material cools more slowly?
 
Magma underground
 
Lava on the surface
 
Sediment in water
Which process happens first in the formation of igneous rocks?
 
Cooling of magma or lava
 
Weathering of rock
 
Erosion by wind
Which pair of words correctly matches the location and rock type?
 
Below surface – intrusive
 
Surface – sedimentary
 
Surface – metamorphic
What is one feature of extrusive igneous rocks?
 
Small crystals
 
Large layers
 
Soft texture
What is one feature of intrusive igneous rocks?
 
Large crystals
 
Layers
 
Contains fossils
Which type of igneous rock is formed inside volcanoes but below the surface?
 
Intrusive
 
Extrusive
 
Sedimentary
Why does lava cool faster than magma?
 
It is exposed to air and water
 
It is deeper underground
 
It is under high pressure
Which word describes the change from liquid magma to solid rock?
 
Solidification
 
Condensation
 
Erosion
What happens to magma as it cools?
 
It solidifies into rock
 
It evaporates
 
It melts further
Which statement best describes igneous rocks?
 
They form from molten rock
 
They form from layers of sediment
 
They form from heat and pressure on other rocks
Which statement about lava is correct?
 
It is magma that has reached the surface
 
It forms deep underground
 
It is already solid rock
What causes magma to turn into solid igneous rock?
 
Loss of heat
 
Increase in pressure
 
Weathering
Where does intrusive igneous rock form?
 
Below the Earth’s surface
 
On the Earth’s surface
 
Under the ocean only
Which of the following is an example of an extrusive igneous rock?
 
Basalt
 
Marble
 
Granite
Which of the following is an example of an intrusive igneous rock?
 
Granite
 
Basalt
 
Sandstone
Why do extrusive igneous rocks usually have small crystals?
 
They cool quickly at the surface
 
They cool slowly underground
 
They are pressed by layers
Why do intrusive igneous rocks usually have large crystals?
 
They cool slowly underground
 
They cool very fast
 
They are formed by layers
What type of igneous rock forms when lava cools quickly on the Earth’s surface?
 
Extrusive
 
Intrusive
 
Metamorphic
What type of igneous rock forms when magma cools slowly underground?
 
Intrusive
 
Extrusive
 
Sedimentary
Which process changes magma or lava into solid igneous rock?
 
Solidification
 
Erosion
 
Evaporation
What is molten rock called when it reaches the Earth’s surface?
 
Lava
 
Magma
 
Granite
What is molten rock called when it is found below the Earth’s surface?
 
Magma
 
Lava
 
Rock
How are igneous rocks formed?
 
By cooling and solidifying of molten rock
 
By erosion and weathering
 
By layers of sediment being pressed together
What does the word igneous mean?
 
Fire
 
Water
 
Earth
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