Explanations:The Aravali Range is a significant geographical feature in Rajasthan, India. It is a mountain range that runs from the northwestern part of the state to the southeastern part, spanning approximately 800 kilometers. The Aravali Range is one of the oldest mountain ranges in the world, formed over 1.8 billion years ago during the Archean era. It is a crucial geographical boundary that separates the Thar Desert in the northwest from the fertile plains in the southeast of Rajasthan.
The Thar Desert, also known as the Great Indian Desert, is a large arid region located in the northwestern part of the Indian subcontinent. It covers a significant portion of Rajasthan and extends into parts of Gujarat, Punjab, and Haryana. The Aravali Range acts as a natural barrier that influences the climate and ecology of the region. The western side of the range, which faces the Thar Desert, receives less rainfall, contributing to the desert's arid conditions. In contrast, the eastern side of the range receives more rainfall, leading to a more fertile and agriculturally productive landscape.
The Aravali Range is not only a geographical feature but also holds significant ecological importance. It is home to diverse flora and fauna, including several endemic species. The range also plays a crucial role in the water resources of Rajasthan, as it is the source of several rivers and streams that provide water to the region. The Aravali Range is a vital part of Rajasthan's geography and is often a topic of interest in geography and environmental studies.
It is important to note that while the Aravali Range is the major hill range in Rajasthan, there are no "Northern Mountains" in the state. The term "Northern Mountains" is not a recognized geographical feature in Rajasthan. Therefore, the correct answer to the question is the Aravali Range, which is the hill range that separates the Thar Desert from the rest of Rajasthan.