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ROCKS-2

WHAT ARE ROCKS?

Rocks are naturally occurring solid substances composed of one or more minerals or mineraloids. They form the Earth’s crust and have a variety of types, compositions, and uses.

FORMATION OF ROCKS

  • Igneous Rocks: They form either beneath the Earth’s surface (intrusive, e.g., granite) or from volcanic eruptions (extrusive, e.g., basalt).
  • Sedimentary Rocks: These rocks are created by the deposition of mineral and organic particles over time. The process includes weathering, erosion, and lithification.
  • Metamorphic Rocks: When existing rocks (igneous, sedimentary, or other metamorphic rocks) are subjected to extreme conditions like heat and pressure, their structure and mineral composition change.

    • ROCK CYCLE AND USES OF ROCKS

    Rocks are constantly being recycled through the rock cycle, where igneous rocks can become sedimentary or metamorphic through processes like weathering, compaction, and heat. This cycle illustrates the dynamic and ever-changing.

    Uses:

  • Construction: Rocks like granite, limestone, and sandstone are commonly used in building materials, countertops, and monuments.
  • Energy Resources: Coal (sedimentary) and oil shale are important energy resources.
  • Industrial: Certain rocks provide raw materials for manufacturing, such as marble for sculptures or basalt for road construction.
  • Soil Formation: Weathered rock particles contribute to soil formation, supporting plant life

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