The correct option is (c).
Explanation
A plateau is an elevated flatland standing above the surrounding area. Plateaus can be classified based on their mode of formation and geographical location. The Deccan Plateau in India and the Tibetan Plateau in Central Asia are two significant examples representing different geological characteristics.
Statement-wise Analysis
- Statement 1 is Correct: The Deccan Plateau is one of the oldest landmasses in India. It was formed by volcanic activity (flood basalts) during the Cretaceous period and constitutes a stable block of the earth's crust that was part of the ancient Gondwanaland.
- Statement 2 is Incorrect: The Tibetan Plateau is not the lowest; rather, it is the highest and largest plateau in the world. It is often referred to as the "Roof of the World" due to its extreme elevation.
- Statement 3 is Correct: The Tibetan Plateau has an average elevation exceeding 4,500 metres. Its height generally ranges between 4,000 to 6,000 metres above mean sea level, making it a unique intermontane plateau surrounded by mountain ranges.
Key Takeaway: The Deccan Plateau is an ancient volcanic plateau associated with Gondwanaland, whereas the Tibetan Plateau is the highest plateau in the world, formed by the collision of the Indo-Australian and Eurasian plates.