The characteristics described match Laterite soil, which:
1. Develops in regions with high temperatures and heavy rainfall.
2. Forms due to intense leaching, where nutrients are washed away by rain, leaving the soil infertile.
3. Has low humus content because the warm and humid conditions accelerate the decomposition of organic matter.
Other options do not fit:
- Arid soil: Found in dry areas, not associated with heavy rain.
- Yellow soil: Typically forms in forested regions, not due to leaching.
- Black soil: Known for its high fertility and is associated with cotton production.
On the day of her examination, Riya sharpened her pencil from both ends as shown below. 
The diameter of the cylindrical and conical part of the pencil is 4.2 mm. If the height of each conical part is 2.8 mm and the length of the entire pencil is 105.6 mm, find the total surface area of the pencil.