Igneous Rocks
Most igneous rocks contain _____________
crystals
What are sedimentary rocks likely to have that other rocks will not have?
fossils
What is it called when a mineral breaks randomly with jagged edges.
fracture
Name the three types of rock groups.
Sedimentary, Igneous and Metamorphic
The process of rocks changing from one kind of rock to another kind of rock over long periods of time.
Rock cycle
What will the texture of an igneous rock be if it cools slowly?
Coarse
These are two ways that sediments are formed.
Weathering and erosion
The Moh's test of hardness shows the resistance the mineral has against what?
being scratched
What is the process in which water, wind, ice and heat break down rock?
weathering
What are all rocks composed of?
minerals
How can you tell that an igneous rock cooled quickly?
Its crystals will be small
These 2 things cause metamorphic rocks to form.
heat and pressure
Minerals are natural occurring solids with a definite chemical composition and crystalline structure. What trait is missing?
inorganic
What is the movement of sediment after weathering is called?
erosion
What type of rock is formed when magma from volcanic eruptions cools and solidifies?
igneous
This type of igneous rock is black with a glassy texture. We looked at it in class.
obsidian
For an Igneous rock to become a sedimentary rock, what needs to happen?
weathering, erosion, compaction, and cementation
How do you test for streak?
by rubbing it on a ceramic (streak) plate to get a powder.
Why is weathering important?
because it breaks rocks down into fragments or sediments from which sedimentary rocks are formed.
What process change a sedimentary rock into a metamorphic rock?
Heat and pressure
This determines the size of crystals that form in igneous rocks.
How fast it cools
What is another name for the banding that happens to mineral when heat and pressure are applied to a metamorphic rock?
foliation
You can see this property just by looking at a mineral. Many minerals can be several of these so its not a good way to identify it.
color
What type of weathering is abrasion?
physical
The 5 ways to test the properties of a mineral.
Luster, streak, hardness, color and cleavage or fracture