A rock that has alot of silica in it would be this color.
What is white?
100
A rock that is formed under a volcano.
What are intrusive rocks?
100
This rock is a intrusive rock that has a high silica content, it is also what stone mountain is made of.
What is Granite?
100
This rock was and is still commonly used to make sharp tools such as arrow heads or scalps for more modern uses.
What is Obsidian?
200
Igneous rocks that form below the ground.
What are intrusive rocks?
200
A igneous rock that has very little silica in it would be this color.
What is black?
200
A rock that is formed outside a volcano after it erupts lava.
What are extrusive rocks?
200
This rock is an extrusive rock that has very low silica content, it also is very smooth but careful...it can be very sharp, infact as sharp as one atom thick.
What is obsidian?
200
This rock is very durable and is commonly used for statues, such as the ones that are carved into stone mountain.
What is granite?
300
Intrusive rocks usually form from this substance.
What is magma?
300
This rock would obvious contain very little silica, and also was used for projectiles in the past because it can be made so sharp.
What is Obsidian?
300
It is a mineral that makes rocks have their color i.e. black or white.
What is silica?
300
This rock is the most common extrusive rock and it makes up most of our sea floors.
What is Basalt?
300
This rock is commonly used to smooth or polish expecially for people that have callouses on their hands and it's ok if you drop it in the tub, it floats!
What is pumice?
400
Extrusive rocks usually form from this molten rock.
What is lava?
400
This rock is light in color which would be why it has alot of this substance.
What is silica?
400
This is the name given to molten rock that has been expelled from a volcano.
What is lava?
400
This rock is the most common intrusive rock.
What is granite?
400
This rock is coase grain rock that is notable for it's usual specled pattern, it is also the most common intrusive rock so it is seen all around the world in art work.
What is granite?
500
This substance determines the color of many igenous rocks.
What is silica?
500
This is the name given to molten rock that is still under a volcano.
What is magma?
500
This is not a rock but a mineral that is almost always found in igneous rocks.
What is silica?
500
This rock used in concrete and is also the most common extrusive rock in the world, but it was definatly not named by a sheep.