Geography:Rocks Flashcards
1
Q
What are the three types of rocks?
A
Igneous,Sedimentary and Metamorphic.
2
Q
Intrusive meaning
A
form inside the crust
3
Q
Extrusive meaning
A
form outside the crust
4
Q
Igneous rock
A
Type of rock formed from lava and magma .
Latin for fire
Example:
Basalt:dark grey or black
-extrusive ,cools on the surface.
-Small crystals don’t have time to grow,because they have lots of mica (mineral).
Granite:Speckled grey,black,white,purple.
Intrusive,cools within the crust ,cools slowly.
5
Q
Sedimentary rock
A
Formed in shallow water
Sandstone layers
Weathering and erosion breaks down rocks into small fragments called ‘sediments’.
6
Q
Metamorphic rocks
A
Heat and pressure
Change in latin
Formed from igneous rocks
