Hot lava eye flakes11/2/2023 The weather, running water, and ice wear them down. Rocks, like mountains, do not last forever. Hot liquids or gases from the magma also can cause chemical changes in the rock around the magma. It is very hot and bakes the rock through which it moves. Another way that high temperatures occur is when magma rises through the earth's upper crust. The deeper below the surface of the earth, the higher the temperature, so deep burial also means high temperatures. The pressure can come from being buried very deep in the earth's crust, or from the huge plates of the earth's crust pushing against each other. Metamorphic Rock is formed by great heat, or pressure, or both. Often, both cementing and compaction take place together. Another way it becomes rock is from being cemented together by material that has been dissolved in water. The sediment gets turned into rock by being buried and compacted by pressure from the weight above it. If there are a lot of pebbles mixed with the sand, it is called gravel. Sand has the largest particles while clay has the smallest. Sedimentary Rock forms from particles, called sediment, that are worn off other rocks. Sometimes, when the magma cools very quickly, it forms a kind of black glass that you cannot see through. When it cools quickly on the surface, the crystals are very small and you would need a magnifier or a microscope to see them. When magma cools slowly underground the crystals are large enough to see. Magma that erupts onto the surface is called lava. Igneous Rock is formed when a magma cools underground and crystallizes or when it erupts unto the surface of the ground, cools and crystallizes. A rock is like the car, a mineral is like the steel, or glass, or plastic. A car is made of steel, glass, and plastic. Minerals are not rocks, rocks are made of minerals. Most rocks are made from more than one mineral, but there are quite a few kinds that are made from only one mineral. Rocks are made of minerals, like quartz, calcite, feldspars, and micas. They are everywhere on earth, but often buried under soil. They are the mountains and the bottom of the ocean. Rocks are what the crust of the earth is made of. Gneiss, Marble, Quartzite, Schist, Serpentinite, Slate The Rock Identification Key - by Don Peck Rock Key Table of Contents The Rock Keyīasalt, Diabase, Diorite, Gabbro, Granite, Obsidian, Pumice, Rhyolite, Scoriaīreccia, Conglomerate, Limestone, Sandstone, Shale
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