3 rock types Flashcards
1
Q
What are the two types of igneous rock?
A
extrusive - cools quickly above ground making small crystals.
intrusive - cools slowly underground forming big crystals.
2
Q
What is igneous rock?
A
Igneous rock - forms when molten magma pushes up into the crust before cooling and solidifying. e.g granite.
3
Q
what is sedimentary rock?
A
Sedimentary rocks - are formed by layers of sediment laid down in lakes or seas. and contain fossils. e.g limestone or chalk.
4
Q
What is metamorphic rock?
A
Metamorphic rocks - are formed by heat and pressure on sedimentary rocks over periods of time. e.g marble
