Which of the following type of soil is found in the districts of Thanjavur, Tiruvarur, Nagapattinam, Villupuram, Cuddalore, Tirunelveli and Kanyakumari?

🔑Key Points:
Alluvial Soil 
-It is formed by the deposition of silt by the rivers.
-It is found in the river valley regions and the coastal plains of Tamil Nadu.
-Generally, this type of soil is found in the districts of Thanjavur, Tiruvarur, Nagapattinam, Villupuram, Cuddalore, Tirunelveli and Kanyakumari. Hence, Option 1 is correct.
-It is also found to a small extent along the river valleys in a few interior districts.

🔴Additional Information:
Black Soil
-It is formed by the weathering of igneous rocks.
-It is also known as regur soil.
-As cotton grows well in this soil, it is also called black cotton soil.
-Black soils are found extensively in the districts of Coimbatore, Madurai, Virudhunagar, Tirunelveli and Thoothukudi.
Red Soil
-It covers over two-thirds of the total area of Tamil Nadu.
-They are found particularly in the central districts of the state.
-It is dominantly found in Sivagangai and Ramanathapuram districts.
Laterite Soil
-This soil is formed by the process of intense leaching.
-Laterite soils are found in some parts of Kancheepuram, Tiruvallur and Thanjavur districts and some patches over the mountainous region in the Nilgiris.