Igneous Rocks
Igneous rocks are rocks can come in different shapes,colors and textures. The textures can range from glassy to coarse and everywhere in between! Igneous rocks form when magma or lava cools.
Extrusive and Intrusive
Igneous rocks can either be extrusive rocks or intrusive rocks. An extrusive rock is when the igneous rock is formed from lava that has erupted onto earth's surface. An intrusive rock is when the igneous rock is formed when magma hardened under earth's surface.
Examples of Metamorphic Rocks
An example of Igneous Rocks are obsidian rocks. Obsidian rocks are black, very smooth,glassy rocks. Their texture is almost greasy in a way.
Another example of an igneous rock is the pegmatite rock. The pegmatite rock is an intrusive igneous rock, and it is very coarse-grained. It's colors are bronze,gray and black.
A porphyry rock is another intrusive igneous rock. The porphyry is a black rock with light brown spots on it. It has small crystals surrounding larger crystals on it.
My last example is a rhyolite rock. The rhyolite rock is an extrusive igneous rock. It is very fine-grained, and is a gray rock.
Igneous rocks are used for many different things. Pumice has a very rough surface and can be used for cleaning/polishing, perlite can can be mixed with soil for vegetable seeds,Granite can be used for sculptures or as decorations, many types of igneous rocks can be used as roads, etc.
Another example of an igneous rock is the pegmatite rock. The pegmatite rock is an intrusive igneous rock, and it is very coarse-grained. It's colors are bronze,gray and black.
A porphyry rock is another intrusive igneous rock. The porphyry is a black rock with light brown spots on it. It has small crystals surrounding larger crystals on it.
My last example is a rhyolite rock. The rhyolite rock is an extrusive igneous rock. It is very fine-grained, and is a gray rock.
Igneous rocks are used for many different things. Pumice has a very rough surface and can be used for cleaning/polishing, perlite can can be mixed with soil for vegetable seeds,Granite can be used for sculptures or as decorations, many types of igneous rocks can be used as roads, etc.
Obsidian rock.
Pegmatite rock.
Porphyry rock.
Rhyolite rock.