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.The oldest rock known today is the Igneous rock. .Igneous rock can be any colour..The word "Igneous" is a Greek word that means fire. Igneous rocks are formed by the cooling of molten rock, lava or magma. When magma solidifies in the earth they are intrusive, when lava cools outside the earth it is extrusive.
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Igneous rock usually appears with a well mixed texture without fossils, bands or layers, may contain vesicles (air bubbles or holes from trapped gases) and does not react with dilute acid.Igneous rocks can:Be glassy or frothy in appearance.Be felsic, intermediate, mafic, or ultramafic in nature.Be porous or full of bubbles.Have large crystal structure like granites.Have small crystal structure like basalts.Have a combination of large and small interlocked crystals.Be more dense than other rock types.Have an interlocking crystalline structure.Appear to be peppered with black specks.Be light enough to float (pumice).Igneous rocks run the gamut from white to black, glassy to coarse-grained.
1. Marble ----- Limestone or dolostone 2. Gneiss ----- Granite or schist 3. Quartzite --- Sandstone 4. Schist ----- phyllite
Igneous Rocks - Rocks formed by crystallization from a melt (magma) types are: # Extrusive (volcanic) - produced when magma flows on the earth's surface # Intrusive (plutonic) - produced when magma solidifies at depth beneath the earth. eg.s are: 1)pumice. 2)Laccolith 3)Batholith 4)Dike 5)Sill
.The oldest rock known today is the Igneous rock. .Igneous rock can be any colour..The word "Igneous" is a Greek word that means fire. Igneous rocks are formed by the cooling of molten rock, lava or magma. When magma solidifies in the earth they are intrusive, when lava cools outside the earth it is extrusive.
Igneous is derived from the Latin word for fire (ignis), which is very appropriate since igneous rock can be created by volcanic action. It is the oldest form of rock and can be found where ever the earth's crust has been opened by volcanoes or earthquakes, allowing molten rock to seep to the surface. (Think: Islands!) Four types of igneous rock exist: 1. Obsidian: extrusive (forced to the surface) igneous rock that is actually glass and not minerals. Sharp edges, smooth surface. 2. Pumice: another extrusive igneous rock but, unlike obsidian, this volcanic rock was pitted by millions of tiny air bubbles. It, too, is glass and not minerals... and it can float! 3. Granite: very hard igneous rock formed deep within the earth and composed of feldspar and quartz. This is intrusive igneous rock because it is formed below the surface of the earth. 4. Scoria: extrusive, glass, with a pitted surface much like pumice. Scoria is more dense and has a darker color with much larger pits.
mount Rushmore
Igneous rock usually appears with a well mixed texture without fossils, bands or layers, may contain vesicles (air bubbles or holes from trapped gases) and does not react with dilute acid.Igneous rocks can:Be glassy or frothy in appearance.Be felsic, intermediate, mafic, or ultramafic in nature.Be porous or full of bubbles.Have large crystal structure like granites.Have small crystal structure like basalts.Have a combination of large and small interlocked crystals.Be more dense than other rock types.Have an interlocking crystalline structure.Appear to be peppered with black specks.Be light enough to float (pumice).Igneous rocks run the gamut from white to black, glassy to coarse-grained.
Over 4 billion years ago.
there are 4 bill bob and jerry and the one in abi's head she likes to call a brain Igneous, Sedimentary, and Metamorphic.
Only in that igneous rock was the first to form on Earth, over 4 billion years ago.
The basic processes involves in igneous rock formation are; 1. Melting (Magma, formation of molten substance). 2. Volcanicity (Eruption, movement of magma). 3. Cooling (Change in temperature). 4. Crystallization (Mineralization, formation of crystals and minerals). 5. Solidification (Consolidation into a solid mass to form igneous rock).
1. Marble ----- Limestone or dolostone 2. Gneiss ----- Granite or schist 3. Quartzite --- Sandstone 4. Schist ----- phyllite
Igneous Rocks - Rocks formed by crystallization from a melt (magma) types are: # Extrusive (volcanic) - produced when magma flows on the earth's surface # Intrusive (plutonic) - produced when magma solidifies at depth beneath the earth. eg.s are: 1)pumice. 2)Laccolith 3)Batholith 4)Dike 5)Sill
1)igneous rock 2)weathering/erosion 3)sediments 4)compact/cementation 5)sedimentary rock 6)heat and pressure 7)metamorphic rock 8)melting 9)magma 10)cooling then the cycle starts all over
Extreme heat, extreme pressure (both for metamorphic), cooling of magma (intrusive igneous rock), and melting of rock (magma that can then become igneous, and further down the "rock cycle road", metamorphic)