What is a key characteristic of the Lushai Hills, located to the south of the Mizo Hills?

Category: Mizoram Gk

Hint: Consider the topography and geological composition of the Lushai Hills.

Correct Answer: C) They are known for their steep gradients and rugged features, predominantly composed of sedimentary rocks.

Exam Relevance: UPSC, SSC, State PSC

Difficulty: Moderate

Explanations:

The Lushai Hills are a significant geographical feature located in northeastern India, specifically within the state of Mizoram. They form part of the larger Mizo Hills, which extend into neighboring countries such as Myanmar. The Lushai Hills are characterized by their steep gradients and rugged features, which are a result of the complex geological processes that have shaped the region over millions of years.

One of the key characteristics of the Lushai Hills is their topography. The hills are not gentle and rolling, but rather they are steep and rugged. This ruggedness is due to the presence of numerous ridges, valleys, and gorges that have been carved out by rivers and streams over time. The steep gradients make the terrain challenging for human habitation and agriculture, which is why the region is not known for extensive agricultural plains.

Another important characteristic of the Lushai Hills is their geological composition. The hills are predominantly composed of sedimentary rocks, which are formed from the accumulation and compression of sediments over long periods. These sedimentary rocks include sandstones, shales, and limestones, which have been uplifted and folded due to tectonic activity. The presence of sedimentary rocks is a key factor in the formation of the Lushai Hills and contributes to their unique topography.

It is important to note that the Lushai Hills are not primarily composed of igneous rocks, which are formed from the cooling and solidification of magma or lava. While igneous rocks can be found in some parts of the region, they are not the dominant rock type in the Lushai Hills. The sedimentary nature of the rocks is a crucial aspect of the region's geological history and contributes to the distinctive landscape.

In summary, the Lushai Hills are known for their steep gradients and rugged features, which are a result of the complex geological processes that have shaped the region. The hills are predominantly composed of sedimentary rocks, which have been uplifted and folded over time. This combination of topography and geological composition makes the Lushai Hills a unique and important geographical feature in northeastern India.

Option Analysis:

Option A: This option is incorrect because the Lushai Hills are characterized by steep gradients and rugged features, not gentle slopes and wide valleys. The topography of the Lushai Hills is quite different from that described in this option.
Option B: This option is incorrect because the Lushai Hills are not primarily composed of igneous rocks. Instead, they are predominantly made up of sedimentary rocks, which have been shaped by various geological processes over time.
Option C: This option is correct because the Lushai Hills are indeed known for their steep gradients and rugged features, and they are predominantly composed of sedimentary rocks. This description accurately reflects the topography and geological composition of the Lushai Hills.
Option D: This option is incorrect because the Lushai Hills are not known for extensive agricultural plains. The rugged terrain and steep gradients make large-scale agriculture challenging in this region.

Mnemonic: Lushai = Lush and rugged

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