What does the word igneous mean?
Fire
Water
Earth
How are igneous rocks formed?
By layers of sediment being pressed together
By erosion and weathering
By cooling and solidifying of molten rock
What is molten rock called when it is found below the Earth’s surface?
Lava
Magma
Rock
What is molten rock called when it reaches the Earth’s surface?
Granite
Lava
Magma
Which process changes magma or lava into solid igneous rock?
Solidification
Erosion
Evaporation
What type of igneous rock forms when magma cools slowly underground?
Extrusive
Intrusive
Sedimentary
What type of igneous rock forms when lava cools quickly on the Earth’s surface?
Intrusive
Metamorphic
Extrusive
Why do intrusive igneous rocks usually have large crystals?
They cool very fast
They cool slowly underground
They are formed by layers
Why do extrusive igneous rocks usually have small crystals?
They cool quickly at the surface
They cool slowly underground
They are pressed by layers
Which of the following is an example of an intrusive igneous rock?
Sandstone
Granite
Basalt
Which of the following is an example of an extrusive igneous rock?
Marble
Granite
Basalt
Where does intrusive igneous rock form?
Below the Earth’s surface
On the Earth’s surface
Under the ocean only
What causes magma to turn into solid igneous rock?
Loss of heat
Weathering
Increase in pressure
Which statement about lava is correct?
It is already solid rock
It forms deep underground
It is magma that has reached the surface
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
What happens to magma as it cools?
It melts further
It evaporates
It solidifies into rock
