Sedimentary rocks are formed through the gradual accumulation of sediment: for example, sand on a beach or mud on a river bed. As the sediment is buried it is compacted as more and more material is deposited on top. Eventually the sediment will become so dense that it is essentially rock. This process is known as lithification.
Metamorphic rocks are rocks which once existed as igneous or sedimentary rocks but have been subjected to varying degrees of pressure and heat within the earth's crust. The processes involved will change the composition and fabric of the rock and their original nature is often hard to distinguish. Metamorphic rocks are typically found in areas of mountain building.
Gallery of Campbell Landscape - Quality landscape architecture,landscape construction,rock formation and landscape design in San Jose
Main Gallery of Campbell Landscape - Quality landscape architecture,landscape construction,rock formation and landscape design in San Jose
Gallery of Campbell Landscape - Quality landscape architecture,landscape construction,rock formation and landscape design in San Jose Gallery of Campbell Landscape - Quality landscape architecture,landscape construction,rock formation and landscape design in San Jose
The other two groups are igneous rocks, which form when magma or molten lava solidifies, and sedimentary rocks, which form when wind or water deposit sediments and the sediments become compacted.
When underground magma flows through a crack (called a dike) into areas of surrounding solid rock (known as country rock), there is a significant difference between the temperature of the magma and the temperature of the surrounding rock.
Rocks that are buried deep beneath many layers of rock experience lithostatic (Greek lithos, “rock”; statikos, “in place”) pressure, which causes the rocks to compress into a smaller, denser form.
Feeds |
Contact