1.1 formation of rocks Flashcards
1
Q
How are igneous rocks formed?
A
magma cools down to form igneous rocks
2
Q
cooled magma forms
A
intrusive rocks
3
Q
cooled lava forms
A
extrusive rocks
4
Q
examples of igneous rocks (2)
A
- Granite
- Basalt
5
Q
when magma cools down faster on the surface ____ crystals are formed
A
tiny crystals
6
Q
when magma cools down slowly beneath the crust surface _____ crystals are formed
A
large
7
Q
How are sedimentary rocks formed?
A
- Small rock particles go through erosion and weathering and accumulate at the seabed.
- Over time layers of sediments are formed and then they go through compaction and cementation to form sedimentary rocks
- Crystals absent
- only rock where fossils are found
8
Q
why do sedimentary rocks contain fossils?
A
The fossils can get compacted and cemented underwater
9
Q
Examples of sedimentary rocks (3)
A
- LImestone
- Sandstone
- Shale
10
Q
How are metamorphic rocks formed?
A
- Formed from the existing rock when heat and/or pressure causes changes in the rock without melting it.
- crystals could be present
11
Q
Examples of metamorphic rocks (2)
A
- Marble
- Slate
