what is rocks and its types
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he three main types, or classes, of rock are sedimentary, metamorphic, and igneous and the differences among them have to do with how they are formed.
Sedimentary
Sedimentary rocks are formed from particles of sand, shells, pebbles, and other fragments of material. Together, all these particles are called sediment. Gradually, the sediment accumulates in layers and over a long period of time hardens into rock. Generally, sedimentary rock is fairly soft and may break apart or crumble easily. You can often see sand, pebbles, or stones in the rock, and it is usually the only type that contains fossils.
Examples of this rock type include conglomerate and limestone.
Metamorphic
Metamorphic rocks are formed under the surface of the earth from the metamorphosis (change) that occurs due to intense heat and pressure (squeezing). The rocks that result from these processes often have ribbonlike layers and may have shiny crystals, formed by minerals growing slowly over time, on their surface.
Examples of this rock type include gneiss and marble.
Igneous
Igneous rocks are formed when magma (molten rock deep within the earth) cools and hardens. Sometimes the magma cools inside the earth, and other times it erupts onto the surface from volcanoes (in this case, it is called lava). When lava cools very quickly, no crystals form and the rock looks shiny and glasslike. Sometimes gas bubbles are trapped in the rock during the cooling process, leaving tiny holes and spaces in the rock.
Sedimentary
Sedimentary rocks are formed from particles of sand, shells, pebbles, and other fragments of material. Together, all these particles are called sediment. Gradually, the sediment accumulates in layers and over a long period of time hardens into rock. Generally, sedimentary rock is fairly soft and may break apart or crumble easily. You can often see sand, pebbles, or stones in the rock, and it is usually the only type that contains fossils.
Examples of this rock type include conglomerate and limestone.
Metamorphic
Metamorphic rocks are formed under the surface of the earth from the metamorphosis (change) that occurs due to intense heat and pressure (squeezing). The rocks that result from these processes often have ribbonlike layers and may have shiny crystals, formed by minerals growing slowly over time, on their surface.
Examples of this rock type include gneiss and marble.
Igneous
Igneous rocks are formed when magma (molten rock deep within the earth) cools and hardens. Sometimes the magma cools inside the earth, and other times it erupts onto the surface from volcanoes (in this case, it is called lava). When lava cools very quickly, no crystals form and the rock looks shiny and glasslike. Sometimes gas bubbles are trapped in the rock during the cooling process, leaving tiny holes and spaces in the rock.
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Rocks are made of minerals .
There are three kinds of rocks : igneous, sedimentary and metamorphic .
Igneous rocks
are also known as fiery rocks . Magma gets pushed upwards towards the surface of the earth where it cools to form solid rocks again .
Granite , basalt are examples of igneous rocks .
Sedimentary rocks are formed from older rocks that have been broken into tiny fragments .
Sandstone , limestone are examples of sedimentary rocks .
Metamorphic rocks are rocks that have gone through some changes .
Marble , slate are examples of this rocks .
Hope it helps you !
Plz plz mark as brainliest !
Rocks are made of minerals .
There are three kinds of rocks : igneous, sedimentary and metamorphic .
Igneous rocks
are also known as fiery rocks . Magma gets pushed upwards towards the surface of the earth where it cools to form solid rocks again .
Granite , basalt are examples of igneous rocks .
Sedimentary rocks are formed from older rocks that have been broken into tiny fragments .
Sandstone , limestone are examples of sedimentary rocks .
Metamorphic rocks are rocks that have gone through some changes .
Marble , slate are examples of this rocks .
Hope it helps you !
Plz plz mark as brainliest !
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