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What rock can only be formed from sedimenta rock or igneous rock?
Metamorphic rocks. With proper heat and pressure sedimentary and igneous rocks can form metamorphic rocks.
Why do metamorphic rocks often form deep under the surface of the earth?
Metamorphic rocks form deep under the Earth's surface because the high pressures and temperatures required for the transformation of existing rocks into metamorphic rocks are typically found at greater depths. These conditions are usually created by tectonic forces or by the burial of rocks under layers of sediment.
Does Metamorphic rocks form only from igneous rocks true or false?
False. Metamorphic rocks can form from igneous, sedimentary, or other metamorphic rocks through processes such as heat, pressure, and/or chemical activity. The rock's original composition and mineralogy can change during this process.
All rocks are made of sediments?
Not all rocks are, only sedimentary rocks are truly made up of sediments. Some metamorphic rocks do because they are formed when heat and pressure are applied to sedimentary rocks, which makes sediments the basis of these rocks as well
Are all rocks volcanic?
No. Rocks can be classified into three general groups: Igneous rocks, which form from molten rock Sedimentary rocks, which form from broken-down rocks turned back into stone Metamorphic rocks, which form as rocks change due to heat and pressure without melting. Igneous rocks are further divided into intrusive rocks, which cool underground, and extrusive rocks, which cool above ground. Only extrusive igneous rocks are considered volcanic.
Why are metamorphic rocks created deep in earth's crust not on the surface?
Metamorphic rocks rarely form on Earth's surface because it needs an intense amount of heat & pressure to form. Earth's surface doesn't have as much heat as the mantle and the core. It also doesn't have much pressure but gravity.
Rocks can fold and bend under intense heat and pressure?
Rocks will fold when the heat and pressure are significant enough to allow "plastic or ductile deformation" to occur, giving rise to folds or bends. Before this point, deformation is "brittle", and is associated with faulting/cracking of the rock. Rocks rarely melt in the lithosphere. Melting only occurs when temperatures are extremely high (say at a contact zone with an igneous intrusion) or if water is added, say in a subduction zone. Even when rocks do melt, complete melting almost never occurs, and only a small fraction of the bulk rock will melt. This is because reactions between heated minerals result in the formation of new minerals which are stable at higher temperature or pressure.
What does a sedimentary rock before it can turn into a metamorphic rock?
Not sure what you are trying to ask. Sedimentary rocks form from sediments, but can be metamorphosed only by applied heat &/or pressure.
What type of rock can only form deep underground?
Metamorphic rock can form deep underground under high pressure and temperature conditions. This type of rock is typically found in the lower parts of Earth's crust and upper mantle where intense heat and pressure can change the structure of existing rocks.
Why do minerals only occur in metamorphic rocks?
because of the metamorphism when temperature and pressure inside earths crust change that were present in the rock when it formed
Does obsidian change into slate when under extreme pressure and heat?
Slate is primarily a sedimentary rock, originating from very fine clays deposited in deep water - or at least distant from shore. It is only mildly metamorphosed by heat and pressure. Often a good source of fossils.Obsidian on the other hand is volcanic glass, generally derived from melting and re-freezing of rhyolite lava
Fossils are found only in .?
Sedimentary rocks
