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Sedimentary rocks (most famously those forming Hutton's unconformity formed by steeply dipping tectonically disturbed Silurian greywackes overlain by Devonian sandstones).

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Are sand pebbles water and plaster mixed together an igneous metamorphic or sedimentary rock?

At this point they are none of the above. They are sediment. If lithified they will form sedimentary rock.


How are sedimentary and metamorphic rocks similar and different?

They are both rocks. Sedimentary can contain metamorphic rocks. and vice versa.


Can metamorphic rocks be sedimentary or igneous rocks?

there are several ways such as heat & pressure, melting, chemical weathering, compression, compaction & cementation, but it depends on the kind of rock it is for what process it has to go through. -Cutegirl99


Is there a particular point that the rock cycle begins?

The rock cycle does not have a specific starting point; rather, it is a continuous process that involves the transformation of rock types—igneous, sedimentary, and metamorphic—through various geological processes. For instance, igneous rock can be weathered and eroded to form sedimentary rock, while sedimentary rock can be subjected to heat and pressure to become metamorphic rock. This cycle can also begin with any rock type undergoing changes, highlighting its dynamic and interconnected nature.


How do igneous and metamorphic rocks become sedimentary rocks?

The igneous and metamorphic rock is weathered (broken into smaller pieces by physical and chemical weathering processes) and eroded (movement of particles by wind, water, ice, and gravity). The sediment particles created by these processes eventually reach a point of deposition where they become stationary long enough to be covered by additional sediments. They then become compacted from the weight of additional sediments above them. As they are compacted, cementing minerals form out of the remaining fluids between the sediment particles, gluing the particles together. At this point, the material has become sedimentary rock.


What are the three different type of rock?

The three rock types are sedimentary, igneous, and metamorphic. At one time, early in Earth's history, all rocks were igneous, having solidified from molten rock. From a textural point of view the differences are as follows: Sedimentary: grains of similar or differing sizes showing variable sphericity and roundness either grain or matrix supported. Igneous: crystalline grains interlocking but not showing any preferred orientation. Metamorphic: crystalline grains (for the most part except low grade metamorphic rocks) interlocking, showing preferred orientation (alignment) and associated metamorphic minerals such as garnet, kyanite and sillimanite for example. Formation:Igneous rocks, which are formed from magma cooling underground, or lava above ground are formed from previous igneous, metamorphic, or sedimentary rocks which have become melted, usually as a result of plate collision and subduction. When these igneous rocks are exposed to weathering and erosion, they break down into smaller particles that are transported by wind and water to a place of deposition, where they can form into sedimentaryrock strata, through a process of lithification, where excess water is squeezed out by overburden pressures and the particles are cemented together by various minerals precipitating out of solution. Igneous and metamorphic rocks can both be turned into sedimentary rocks in this way. Igneous and sedimentary rocks can also be changed by heat and/or pressure into metamorphic rocks, by transforming their existing mineral structures into new minerals or realigning the existing minerals. There are different degrees of metamorphism, so even an existing metamorphic rock can become a different metamorphic rock.


What 2 groups of rock are formed from all 3 kinds of rock?

Technically all 3 can make up each Sedimentary, Metamorphic, and Igneous. But the process of metamorphosis is really kinda of linear, and you can only metamorphose a Metamorphic further, so the answer to your question would really be: Igneous and Metamorphic. Here is the explanation of the Rock Cycle: # Magma cools to form igneous rock after a volcanic event. # Igneous rock undergoes weathering to form sediment. The sediment is taken somewhere and deposited. (i.e. the beach, delta, bottom of a body of water or in sand dunes). # The deposited sediment undergoes a the processes that turns it into a rock). (i.e. cementation (think of concrete hardening, but over a much longer period of time) and compaction.) # As the Sedimentary rock becomes buried under more sediment, it goes deeper into the earth. The heat and pressure cause metamorphism to occur. This transforms the sedimentary rock into a Metam orphic rock. This can also happen by a force called Subduction. This happens when one tectonic plate rides up on the other, forcing the lower plate to be pushed deep into the earth. This will happen to the point where it melts and become Magma (see #1) # As the metamorphic rock is buried more deeply (or as it is squeezed by increasing subduction depths), temperatures and pressures will keep rising. when the temperature becomes hot enough, the metamorphic rock melts. The molten rock once again magma. Thus finishing the cycle, starting back at #1. Given that information. There are shortcuts. # Any rock type can be weathered forming sediments, followed by transportation and deposition of the sediment. Metamorphic and Sedimentary rocks can also undergo weathering/erosion. 2. Igneous rocks can undergo metamorphism (with added heat and pressure) to become metamorphic rocks. So Therefore, Igneous rock can be eroded into sediments, Ultimately becoming Sedimentary rock. And it can also be metamorphosed by heat and pressure, becoming a Metamorphic Rock before being melted into Igneous. Sedimentary Rock can also be eroded into sediments, Ultimately becoming another Sedimentary rock. And it can also be metamorphosed by heat and pressure, becoming a Metamorphic Rock before being melted into Igneous. Metamorphic Rock can be eroded into sediments, Ultimately becoming Sedimentary rock. And it can also be metamorphosed farther by heat and pressure, becoming another type of Metamorphic Rock in the line before being melted into Igneous.


How can you compare and contrast the 3 different types of rocks?

Igneous Rocks for from either magma or cooling lava.Sedimentary rocks form from layers of sediments.Metamorphic rocks can be any rock that has changed under great pressure and/or heat.


Would the oldest rocks on earth be igneous or sedimentary?

The creation of igneous rock from magma is dependent on the cooling rate of the magma. Some igneous rocks form almost instantaneously, and others take hundreds of thousands of years. So igneous rock could be the youngest of the three rock types at any given point in time.


What are a mix of of sharp angular pebbles?

A sedimentary rock called "breccia". The sharp angular pebbles making up the breccia could be igneous, sedimentary, or metamorphic. Breccias generally form close to the point of origin of the clast rock, having less time to round those sharp angular edges.


What rocks are a mix of sharp angular pebbles?

A sedimentary rock called "breccia". The sharp angular pebbles making up the breccia could be igneous, sedimentary, or metamorphic. Breccias generally form close to the point of origin of the clast rock, having less time to round those sharp angular edges.


How can rock change from sedimentary to a metamorphic rock to igneous rock?

A short answer is that igneous may undergo crystalline restructuring and change under significant heat and pressure (though not enough to completely liquefy it). These changes occur underground and eventually the rock may be considered metamorphic.Igneous rocks that are exposed may be weathered and small particles deposited at riverbeds or ocean bottoms. After a long enough time, in the right conditions, these fragments bond together (much like concrete) to form sedimentary rock.