Rock

Rock

The igneous rocks

The igneous rocks


The first rock I will be talking about is obsidian. Obsidian looks like a dark black glass rock. It forums by lava, and it can forum by water and lava. Obsidian is a igneous rock. It is where lava closes fast.

Another igneous rock is Granite. Granite is forums by slow criticizing lava under earth surface. The color of it can be red, pink, gray etc. Granite is made up of quartz, feldspar etc.

The last igneous rock I am talking about will be Tuff. Tuff is made by exploding volcanos. Tuff is the thickest around volcanos. Tuff is sometimes 100 meters thick. The website I got this from is http://geology.com/rocks/

Metimorphic rocks



Metimorphic rocks


Marble is a metamorphic rock. It is forms with limestone and heat and pressure. That is what makes marble. Marble has minerals in it like clay and graphite etc.

Amphibolite is a metamorphic rock. It forms by heat and pressure. The color of it is green black and brown. The Amphibolite is a member of the hornblende group.

The last rock I will be talking about is Soapstone. It is formed by heat and pressure. The use of soapstone is for counter tops, bed wormers, woodstoves, and etc. The web site I used for this is http://geology.com/rocks/.

The rocks.

Sedimentary rocks.

Sedimentary rocks

Coal is a sedimentary rock it is formed by plant derbies. It is usually in swaps. Coal is used for electricity, there are more uses to it to. But the color of it is black. It is found under ground.

The next rock i am talking about is iron ore. How iron ore was made was when the first organism capsule was letting oxygen in the water. Iron is used for steel, ships, and beams, etc.

The last rock I will be talking about is Chert. How Chert is made is when microcrystals of silicon grow with dioxide sedimentary that will become chalk or limestone. Where I got all of this info I give credit to http://geology.com/rocks/sedimentary-rocks.shtml

How obsidian can go through all of the cycles.

Obsidian went through one cycle all ready the igneous stage. It goes through by the magma cools down. But if it is left out side it could go through weathering. Then it could sink down under ground cloud go through heat and pressure. That is how it could go through all the stages.