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In my opinion yes ultimately all rocks are derived from igneous rocks but we have to keep in mind that rocks are always in movement With reference to the rock cycle this could be explained better The Rock Cycle was probably the first of Earths cycles or systems to be recognized and studied at least in a qualitative sense and it is made up of three rocks igneous sedimentary and metaphoric Igneous rock can change into sedimentary rock or into metamorphic rock Sedimentary rock can change into metamorphic rock or into igneous rock Metamorphic rock can change into igneous or sedimentary rock Igneous rocks are called fire rocks and are formed either underground intrusive or above ground extrusive Underground they are formed when the melted rock called magma deep within the earth becomes trapped in small pockets As these pockets of magma cool slowly underground the magma becomes igneous rocks Igneous rocks are also formed when volcanoes erupt causing the magma to rise above the earths surface When magma appears above the earth it is called lava Igneous rocks are formed as the lava cools above ground On Earths surface wind and water can break rock into pieces They can also carry rock pieces to another place Usually the rock pieces called sediments drop from the wind or water to make a layer The layer can be buried under other layers of sediments After a long time the sediments can be cemented together to make sedimentary rock In this way igneous rock can become sedimentary rock All rock can be heated Inside Earth there is heat from pressure friction and from radioactive decay By this way rocks are like being baked they do not melt but they change It forms crystals and if it has crystals already it forms larger crystals Because this rock changes it is called metamorphic Metamorphosis can occur in rock when they are heated to 300 to 700 degrees Celsius When
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