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This is a Metamorphic rock. It is formed by heat and pressure.

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This is an igneous rock. It is formed by melted rock that came to the surface and cooled down.

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formed by heat and pressure -abraham

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formed from heat and pressure

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Metamorphic rocks are formed under the surface of the earth from the metamorphosis (change) that occurs due to intense heat and pressure (squeezing).

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Metamorphic rocks are made from heat and pressure. Uh, I know nothing else. That's my rock it went through changes.

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Igneous rock is made of molten rock that has cooled down and hardened.

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Sedimentary rock  Chalk is a soft, white, porous, sedimentary carbonate rock, a form of limestone composed of the mineral calcite.

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Igneous rock. It is made from melted rock that came to the surface and cooled down

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this is a sedimentary rock & it was was formed by pressure.

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I chose sedimentary rock. This rock is formed by deposition.

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made from lava whit hat heat.

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Metamorphic rocks are formed by pressure and heat

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this is sedimentary rock that is form through the deposition an examples are river, lakes, and wind

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formed through the cooling and solidification of magma or lava.

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formed by the deposition and subsequent cementation of that material at the Earth's surface and within bodies of water

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This rock is called igneous. Igneous is formed when cooled on Earth's surface.

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These obsidian arrowheads were made out of igneous a rocks, or lava that has cooled on earth's surface.

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Formed when enough pressure is applied to the rock to mash it.

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This rock is an igneous rock. Igneous rock is formed when magma cools on Earth's surface.

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formed by the cooling of molten magma on the earth's surface

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this rock was formed by pressure

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This sedimentary rock was formed by pressure.

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This rock was formed by the heat and pressure

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This rock is a sedimentary rock. You can see the parts that were heated up and applied with pressure to form together to make layers.

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this rock was formed by heat and pressure

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This is a metamorphic rock, and was formed by heat and pressure.

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this is a sedimentary rock, you tell by the way the layers are positioned

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This rock is formed  by the deposition and subsequent documentation of that material at the Earth's surface and within bodies of water.

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This is a igneous rock which is formed by magma that has cooled at the Earths surface.

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Sedimentary rocks are formed by pressure

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Metamorphic rocks are formed when heat and pressure are put onto the rock

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Sedimentary rocks are rocks that are formed by the deposition and subsequent cementation

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This is obsidain rock it is cooled magma and it is igneous it is a quite shiny rock.

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This rock is categorized as Igneous. How this beautiful rock is formed is because of the molten magma that quickly cools onto the earth's surface.

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This is metamorphic rock. It is form when heat and pressure

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Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock

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I chose a metamorphic rock which was formed by heat and pressure.

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This is a metamorphic rock. It was formed by heat and pressure.

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This is a metamorphic rock that was formed by heat and pressure.

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This is a/an example of a/an metemorphic rock, which this is formed by crystals. :D

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This is a sedimentary rock, it was formed by weathering and erosion.

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This is a igneous rock that was formed by magma.

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This is a metamorphic rock that was formed by heat and pressure.

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This is Obsidian it is formed when magma comes in contact with water so it cools off and starts to harden

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This is an igneous rock called scoria. It was formed by being pushed deep into the core of the earth until it was heated to a liquid and then it cooled to form a rock.

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This is a metamorphic rock that was formed by heat and pressure.

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This is a sedimentary rock. It was formed by weathering and erosion.

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This is a metamorphic rock. This rock is formed by when heat and pressure is used to make chemical changes.

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This is a sedimentary rock. This is formed by disposition

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This is a sedimentary rock

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i chose obsidian.It is when lava come out of a volcano and start to harden when it come connected with water.

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This is a metamorphic rock. Is a result of a transformation of a Pre-existing rock.

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This is a metamorphic rock. It is formed when heat and pressure come together to make physical and chemical changes.

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This is a sedimentary rock, formed from deposition

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This is a picture of obsidian. It is when lava come out of a volcano and starts to harden.

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This is a metamorphic rock, metamorphic rocks is a type of rock

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This type of rock is Metamorphic

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This is a metamorphic rock.This rock is formed by heat and pressure.

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This is a metamorphic rock that was formed by extreme heat and pressure.

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This is an igneous rock. Igneous rock

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This is a igneous rock. You can see where the rock has cooled with all of these air pockets. These have expanded and opened.

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This is a pic of obsidian. It is formed when lava comes out of a volcano and the manga hardens.

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This is a metamorphic rock you can see the layers are kind of swirled and compressed.

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This is a metamorphic rock. You can see the layers of rock where it was heated up and compressed.

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This is an igneous rock. Igneous rocks form when magma cools and hardens.

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This type of rock is a metamorphic rock it is formed by heat and pressure

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This is an igneous rock called obsidian, this rock was magma that came out of the volcano and hardened to a rock.

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The rock I chose is sedimentary rock. it forms when little rocks are formed together to make 1 rock.

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I chose a sedimentary rock. You notice that there are many other rocks that have been pushed together into one.

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I chose a metamorphic rock called gneiss.

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This is a limestone rock which is a sedimentary rock

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This sedimentary rock has been formed by broken down rocks.

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Metamorphic Rocks are the minerals they contain are changed chemically, forming metamorphic rocks. Sometimes, they are formed when rocks are close to some molten magma, and so get heated up.

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This is an igneous rock which is obsidian that has been magma until it reaches Earths surface and hardens to become a igneous rock or some sort.

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obsidian rock is a type that has to be melted and then cooled by the air. It is formed by magma and comes out by lava and then cools down into a rock.

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The rock I chose is a sedimentary rock. A sedimentary rock forms when broken down rocks form into 1 rock.

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The rock I chose is a sedimentary rock. It is broken down rocks collected together. You can still see some of the rocks that broke down to create the new rock

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The rock I chose is a igneous rock

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This is a sedimentary rock. It is made by rock fragments fusing together.

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Metamorphic Rocks- The minerals they contain are changed chemically, forming metamorphic rocks. Sometimes, they are formed when rocks are close to some molten magma, and so get heated up.

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This is a type of an  igneous rock called obsidian