<p style=”text-align:justify; margin-bottom:11px”><span style=”font-size:11pt”><span style=”line-height:107%”><span style=”font-family:Calibri,sans-serif”><span lang=”EN-IN” style=”font-size:12.0pt”><span style=”line-height:107%”><span style=”font-family:"Calibri Light","sans-serif"”>The processes that form rocks, when taken together, constitute a single system that cycles and recycles Earth materials over geologic time from one form to another.</span></span></span></span></span></span></p>
<p style=”text-align:justify; margin-bottom:11px”><span style=”font-size:11pt”><span style=”line-height:107%”><span style=”font-family:Calibri,sans-serif”><span lang=”EN-IN” style=”font-size:12.0pt”><span style=”line-height:107%”><span style=”font-family:"Calibri Light","sans-serif"”>As shown in given figure, There are two environments—a surface environment of low pressures andtemperatures and a deep environment of high pressures and temperatures. The surface environment is the site of rock alteration and sediment deposition. Here, igneous, sedimentary, and metamorphic rocks are uplifted and exposed to air and water. Their minerals are altered chemically and broken free from the parent rock, yielding sediment. The sediment accumulates in basins, where deeply buried sediment layers are compressed and cemented into sedimentary rock.</span></span></span></span></span></span></p>
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<p style=”text-align:justify; margin-bottom:11px”><span style=”font-size:11pt”><span style=”line-height:107%”><span style=”font-family:Calibri,sans-serif”><span lang=”EN-IN” style=”font-size:12.0pt”><span style=”line-height:107%”><span style=”font-family:"Calibri Light","sans-serif"”>Sedimentary rock, entering the deep environment, is heated and comes into a zone of high confining pressure. Here, it is transformed into metamorphic rock. Pockets of magma are formed in the deep environment and move upward, melting and incorporating sur-rounding rock as they rise. Upon reaching a higher level, magma cools and solidifies, becoming intrusive igneous rock, which reaches the surface environment when it is uncovered by erosion. Or it may emerge at the surface to form extrusive igneous rock. Either way, the cycle is completed.The cycle of rock change has been active since our planet became solid and internally stable, continuously forming and re-forming rocks of all three major classes. Not even the oldest igneous and metamorphic rocks found so far are the “original” rocks of the Earth’s crust. These were recycled eons ago.</span></span></span></span></span></span></p>
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