Introduction
The rock cycle is a fundamental concept in geology. The processes by which the three primary rock types—igneous, metamorphic, and sedimentary—change from one type to another are referred to as the rock cycle (Berkley, n.d.). The heat in the interior of the Earth, the pressure generated from tectonic forces, the impact of wind, gravity, and water, and physiological activity all contribute to the development, motion, and alteration of rocks (Berkley, n.d.). While each family is different in nature, they are connected, with one family impacting or transforming into another.
Sedimentary Rocks
The first family in the rock cycle is the sedimentary rocks. Organic matter or fragments of other existing stones combine to create sedimentary rocks (National Geographic Society, n.d.). Such kinds of rocks can be classified as clastic, organic, or chemical (National Geographic Society, n.d.).
Sandstone and other clast-rich sedimentary rocks form from fragments of different minerals (National Geographic Society, n.d.). Condensed complex biological substances, such as plants, bones, and shells, form natural sedimentary rocks, such as coal (National Geographic Society, n.d.). The deterioration of exposed stone into tiny fragments is the first step in forming clastic and natural rocks (National Geographic Society, n.d.).
Metamorphic Rocks
Another group of rocks, specifically those subjected to high pressure or heat, is metamorphic rock. There are two types of metamorphic rocks: foliated and nonfoliated (National Geographic Society, n.d.). Foliation occurs when mineral sections in the stone connect with extended or flat rocks at elevated temperatures (National Geographic Society, n.d.).
A good illustration of this change is found in granite, an igneous rock (National Geographic Society, n.d.). Gneiss forms when granite undergoes this process, such as at tectonic plate boundaries (National Geographic Society, n.d.). In this case, foliation is a crucial component in the metamorphic family.
Igneous Rocks
The last family of rocks is igneous, where molten rock cools and solidifies. There are also two ways to create igneous rocks (National Geographic Society, n.d.). They are known as intrusive, or plutonic, igneous rocks when they form within the Earth (National Geographic Society, n.d.). They are referred to as extrusive, or volcanic in origin, igneous stones if they form on or above the Earth’s crust (National Geographic Society, n.d.).
Diorite and granite are two typical instances of such rocks (National Geographic Society, n.d.). Large mineral particles and a rough appearance suggest they cooled within the Earth for thousands or millions of years. This period facilitated the growth of large mineral crystals (National Geographic Society, n.d.). Overall, one can see how a stone from one family can easily transform into a material from another, which shows the interconnectedness of all families.
At the same time, it is noteworthy that the rock cycle is not a strictly linear process, and there can be alternate paths. For example, tectonic movements may guide sedimentary rocks through the igneous stage and into metamorphic rocks by subjecting them to extreme heat and pressure (Haldar, 2020). In geology, such a process is called metasomatism (Haldar, 2020). Furthermore, partial and direct melting of any rock can produce magma (Haldar, 2020). After cooling and solidifying, this substance can form igneous rocks without undergoing sedimentary or metamorphic phases (Haldar, 2020). Therefore, shortcuts are often taken when creating stones and minerals.
Conclusion
In summary, despite their differences, the igneous, metamorphic, and sedimentary families are interconnected, with one family influencing or changing into another. Sedimentary rocks are the first family in the rock cycle. Sedimentary rocks are made up of bits of other stones or organic matter. Metamorphic rocks are rocks that are influenced by heat or pressure. The igneous family of rocks is the last group, consisting of melted hot material that cools and solidifies.
References
Berkley. (n.d.). Rock cycle.
Haldar, S. K. (2020). Introduction to mineralogy and petrology. Elsevier Science.
National Geographic Society. (n.d.). The rock cycle.