Question

Which one of the following processes is responsible for the weathering of rocks in a Karst region?
(A) Hydrolysis
(B) Carbonation
(C) Oxidation
(D) Scree formation

Answer 1

Hint: Weathering is the breakdown or dissolution of rocks and minerals on the Earth's surface. Water, ice, acids, salts, plants, animals, and temperature fluctuations are all weathering agents. After a rock has been broken down, erosion moves the rock and mineral fragments away.

Complete answer:
The dissolving of soluble rocks such as limestone, dolomite, and gypsum creates karst terrain. It's known for its sinkholes and caverns, as well as subterranean drainage networks. Given the appropriate conditions, it has even been reported for more weathering-resistant rocks like quartzite. With few or no rivers or lakes, subterranean drainage may reduce surface water. However, in areas where the dissolved bedrock is covered (perhaps by debris) or limited by one or more non-soluble rock layers, unique karst characteristics may only be visible at subterranean levels and may be completely absent above ground.
Chemical weathering is the process of chemical reactions eroding and disintegrating rock. Oxidation, hydrolysis, and carbonation are examples of these processes. These processes either create or destroy minerals, changing the mineral makeup of the rock. Chemical weathering of rock minerals is influenced by temperature and, in particular, moisture; chemical weathering of rock minerals happens more quickly in hot, humid climates. The reaction of rock minerals with carbonic acid is known as carbonation. When water reacts with carbon dioxide, carbonic acid is produced. Minerals in the rock are dissolved or broken down by carbonic acid.
The dissolving of soluble rocks such as limestone, dolomite, and gypsum creates karst terrain. It's known for its sinkholes and caverns, as well as subterranean drainage networks. With few or no rivers or lakes, subterranean drainage may reduce surface water. The process of carbon dioxide dissolving in a liquid is known as carbonation.
Hence option C is correct.

Note:
After the rock has broken down, the elements left behind mix with organic substances to form soil. Weathering processes along with erosion and re-deposition are responsible for many of Earth's landforms and landscapes. Weathering is an important component of the rock cycle, and sedimentary rock, which is produced from earlier rock's weathering products, covers 66 percent of the Earth's continents and much of the ocean bottom.