What type of rocks are formed by processes powered by the sun?
A. metamorphic
B. sedimentary
C. igneous
The Correct Answer and Explanation is :
The correct answer is B. sedimentary rocks.
Explanation:
Sedimentary rocks are formed primarily through processes that are powered by the energy from the sun. These processes include weathering, erosion, transport, and deposition of materials on the Earth’s surface, which are essential steps in the formation of sedimentary rocks.
- Weathering:
The sun’s energy drives weathering, which is the breakdown of rocks into smaller particles through physical, chemical, and biological processes. Physical weathering occurs due to temperature changes caused by the sun’s heat, such as when rocks expand and contract, leading to cracking and breaking. Chemical weathering happens when minerals in rocks react with water and gases in the atmosphere, facilitated by sunlight, causing the rocks to break down. - Erosion and Transport:
After weathering, the broken-down particles are transported by agents like wind, water, and ice. The movement of these particles is primarily driven by solar energy, especially in processes involving water and wind. For example, the sun heats up the Earth’s surface, leading to evaporation and the formation of clouds, which eventually leads to precipitation. Water, in the form of rivers, streams, and waves, moves sediment from one place to another. Wind, also driven by the sun, carries smaller particles like sand and dust. - Deposition and Lithification:
Once these particles are transported to a new location, they accumulate in layers through a process called deposition. Over time, layers of sediment build up, and the weight of the overlying materials compresses the lower layers. Eventually, these sediments become compacted and cemented together, forming sedimentary rocks. Common examples include sandstone, limestone, and shale.
Sedimentary rocks provide key records of Earth’s history, containing fossils and clues about past environments, and are integral to studying the Earth’s surface processes powered by solar energy.