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Outline how igneous rocks become sedimentary rocks and name the processes that are involved in this transformation.

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Solution

Igneous rocks transform into sedimentary rocks through a process known as the rock cycle. Here are the steps involved:

  1. Weathering: The first step in this transformation involves the breakdown of igneous rocks into small particles. This process is known as weathering. It can occur physically (through the action of wind, water, or ice) or chemically (through the action of certain chemical reactions).

  2. Erosion and Transport: The small particles or sediments produced by weathering are then transported by natural agents like water, wind, or ice. This process is known as erosion. The sediments can be carried away for long distances depending on the strength of the transporting agent.

  3. Deposition: The transported sediments are eventually deposited when the natural agents lose their energy. This process is known as deposition. The place where the sediments are deposited is called a basin.

  4. Lithification: Over time, more and more layers of sediments accumulate in the basin. The weight of the overlying layers compacts the lower layers. This, along with the process of cementation (where minerals bind the sediments together), turns the loose sediments into a hard rock. This process is known as lithification.

  5. Formation of Sedimentary Rocks: The end result of lithification is the formation of sedimentary rocks. These rocks can then be uplifted due to the movement of the Earth's crust and the process can start all over again.

So, the processes involved in the transformation of igneous rocks into sedimentary rocks are weathering, erosion, deposition, and lithification.

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