Explanation: The Aravalli Range is a significant geological feature in the state of Rajasthan, India, and is one of the oldest mountain ranges in the country. To understand why the Aravalli Range is considered an old mountain, it is essential to delve into the geological history of the region.
The Aravalli Range is estimated to be around 1,800 million years old, dating back to the Precambrian era. This makes it one of the oldest mountain ranges in the world. The formation of the Aravalli Range is attributed to the collision of two ancient landmasses, which resulted in the upliftment of the region. Over millions of years, the range has undergone significant erosion, which has shaped its current form.
In contrast, the Himalayas, which are often mistaken for being the oldest mountains in India, are relatively young, having formed around 50 million years ago due to the collision of the Indian and Eurasian tectonic plates. The Rocky Mountains in North America and the Andes in South America are also much younger and are not located in India.
The Aravalli Range is not only significant for its age but also for its ecological and geographical importance. It acts as a natural barrier, influencing the climate and weather patterns of Rajasthan. The range is also home to diverse flora and fauna, including several endemic species.
Understanding the geological timeline and the formation processes of mountains is crucial for comprehending the geographical features of a region. The Aravalli Range, being one of the oldest mountain ranges in India, provides valuable insights into the ancient geological history of the region and serves as a key reference point for studying the evolution of the Indian subcontinent.
In summary, the Aravalli Range is the correct answer because it is one of the oldest mountain ranges in India, dating back to the Precambrian era, and is a significant geological feature in the state of Rajasthan. This makes it distinct from the younger Himalayas and the non-Indian Rocky and Andes mountains.