How Can Rocks Be Classified? Flashcards
What is a rock?
A rock is a natural solid made of one or more minerals
How rocks are classified?
By how they form.
What are the 3 types of rocks?
- Igneous
- Sedimentary
- Metamorphic
How the igneous rock form?
When hot magma cools.
Name to ways a igneous rock can be formed?
- Deep inside where magma slowly cools.
2. When a volcano erupts.
How do the rocks give clues of where it formed?
- If the rocks slowly cools beneath Earth, it will have large cristals that can be seen with unaided aye.
- If the rocks cools on the surface it will cool slowly, this means their crystals will be very small and will be only seen with a magnifyning glass or a microscope.
Name examples of igneous rocks who form beneath the earth.
Gabbro and Granite
Name examples of igneous rocks who form on the Earth’s surface.
Basalt and Rhyolite
What is a sedimentary rock?
It forms when sediment get cemented together under pressure.
Tell the process of how the sedimentary rocks form.
- The sediment on a river.
- More sediment falls on the river, this adds pressure
- Over time the sediment get cemented together.
Tell examples of sedimentary rocks?
Shale, sandstone and conglomerate
How are they distinguished?
By they size of sediment they contain.
Do the sedimentary rocks contain fossils?
Yes
What are the 2 ways metamorphic rocks form?
- Super hot fluids touches the rock
2. High tempareture and high pressure or viceversa
Where does the word metamorphic come from?
From a greek word that means “to change form”