ARAVALI HILLS DEGRADATION 

The Aravalli Hills represent a 1.5–2-billion-year-old fold-mountain system formed during the Proterozoic era. The Aravalli Hills are among the oldest mountain ranges in the world, formed over 1.5 billion years ago. They stretch for about 700 km, starting from Gujarat, passing through Rajasthan, and ending in Haryana and Delhi. Unlike the Himalayas, which are young fold mountains, the Aravallis are heavily eroded and structurally fragile. Their geographical alignment forms a natural barrier between the Thar Desert and the Indo-Gangetic Plains.

 Although they are not very high mountains today, the Aravallis play a very important role in protecting the environment of North India. In recent decades, however, these hills have been severely damaged due to human activities, leading to serious environmental problems. This process is called degradation of the Aravalli Hills.

 Historically, the Aravallis supported dense forests and diverse wildlife. However, population growth, industrialization, and economic pressures have intensified anthropogenic activities in the region. The National Capital Region (NCR), which depends heavily on Aravalli ecosystems for environmental stability, has witnessed severe ecological stress due to the range's degradation.

 Understanding the degradation of the Aravallis is critical not only for environmental protection but also for ensuring water security, climate resilience, and sustainable development in northern India.

Illegal Mining

Mining for marble, granite, sand, and stones is the biggest cause.

Impacts of mining:

• Hills are cut and flattened

• Forests destroyed

• Dust pollution increases

• Groundwater sources damaged

Even though courts have banned mining in many areas, illegal mining still continues.

Deforestation

Trees are cut for:

• Construction

• Fuelwood

• Expanding agriculture

• Urban development

Effects:

• Soil becomes loose and erodes easily

• Less rainfall absorption

• Wildlife loses habitat

Urbanization and Real Estate Development

Cities like Gurugram, Faridabad, and parts of Delhi have expanded into Aravalli areas.

Activities include:

• Farmhouses

• Luxury housing

• Roads and highways

• Resorts

This destroys natural land and blocks water recharge zones.

Overgrazing

Too many animals grazing in the same area removes grass and plants.

Result:

• Soil becomes dry and weak

• Increases risk of desertification

Pollution and Waste Dumping

• Industrial waste dumped in forest areas

• Construction debris fills natural valleys

• Polluted water harms plants and animals

Mining Activities

The Aravallis contain rich deposits of marble, granite, limestone, quartzite, and sand. Both legal and illegal mining have:

• Destroyed hill slopes

• Lowered groundwater tables

• Increased dust pollution

• Caused habitat fragmentation

Large-scale mining in Rajasthan and Haryana has permanently altered landscapes, leaving behind abandoned pits and degraded land.

Urban Expansion

Cities such as Gurugram, Faridabad, Jaipur, and Delhi have expanded into Aravalli forest areas. Key issues include:

• Real estate development

• Construction of highways and infrastructure

• Farmhouses and luxury housing encroachments

• Land-use conversion from forest to commercial zones

Urban pressure has significantly reduced forest cover in the NCR region.

 Deforestation and Fuelwood Extraction

Local dependence on fuelwood and timber has led to thinning of forest cover. In many areas, natural forests have been replaced by invasive species.

Industrialization and Pollution

Industrial clusters discharge untreated waste into nearby water bodies. Dust from mining and construction contributes significantly to particulate matter (PM2.5 and PM10) levels in Delhi-NCR.

Policy and Governance Failures

Despite regulations, enforcement remains weak due to:

• Political interference

• Corruption

• Lack of coordination between states

• Insufficient monitoring mechanisms