Prelims Focus 30th April 2026

30/04/2026

15 3 minutes read

Luzon Island

In News: Oil price increases are a new threat to inflation, following recent interest rate rises globally that curbed inflation during the COVID-19 pandemic.

The sacrifice ratio is an economic indicator of the impact of inflation on a nation’s total output and production.
This ratio is found by dividing the change in production by the percentage change in inflation; it tells the amount of lost production for every 1% fall in inflation.
Importance
- The sacrifice ratio is the number of output lost associated with a reduction in inflation.
- It can be used to decide on how much output may decline when inflation is decreased using instruments such as interest rates.

Index of Service Production (ISP)

In News: The National Statistical Office has recommended a new Index of Service Production (ISP) with a base year of 2024-25.

Services account for over 50% of the Gross Value Added (GVA) in India, but unlike the Index of Industrial Production (IIP), there are no indices to measure short-term performance.
The ISP will address this and integrate with the IIP to provide a better assessment of the economy.
Currently, real-time monitoring of services is restricted without an index of its own.

Geophagy

In News: Gibraltar’s Barbary macaques are found to eat soil (geophagy) more frequently than others.

Geophagy is the common practice of ingesting soil, clay or other substances such as chalk or kaolin.
It can be found in various animal groups and among humans, particularly in tropical areas.
It is observed in many cultures and particularly in Africa, pregnant women, children and rural communities.
It can be related to health or nutritional needs, i.e., nausea, but its causes are unclear.

Discovery of Holocene epoch

In News: A 8,000–12,000-year-old marine fossil bed from the Holocene epoch was discovered in Panaiyur, Thoothukudi, Tamil Nadu, following heavy rains in 2023. Confirmed by the Zoological Survey of India (ZSI), this finding showcases Mollusca specimens, indicating the region was likely shallow sea or coastline, enhancing understanding of India’s Quaternary era climate.

Key Details of the Discovery

Location: Panaiyur, Thoothukudi district, Tamil Nadu.
Age: Middle-to-late Holocene (approx. 8,000–12,000 years ago).
Cause: Torrential rains in 2023 caused erosion, revealing the buried fossils.
Significance: The find includes over 100+ specimens from the Phylum Mollusca, which will aid in understanding past environmental conditions and coastline evolution in Southern India.
Action: The Zoological Survey of India (ZSI) surveyed the site following the discovery, which was reported by local enthusiasts.

About the Holocene Epoch

Timeline: The Holocene is the current geological epoch, beginning approximately 11,700 years ago, immediately following the last Ice Age (Pleistocene epoch).
Characteristics: It is marked by a warming climate, the rise of sea levels, and the stabilization of continents to their present form.
Human Impact: This epoch coincides with the development of human civilization, including the birth of agriculture and the rise of human impact on ecosystems.
Environmental Context: Study of fossils from this period helps scientists understand how fauna, rivers, and coastlines adapted to these warmer conditions.

Atacama Desert

In News: As of April 2026, while it remains a premier astronomical hub, the region faces growing threats from light pollution due to industrial development, particularly from mining and new energy projects, which are beginning to endanger its famously pristine night skies.

Key Facts About the Atacama Desert

Geographical Location: Situated in northern Chile, stretching along the Pacific coast west of the Andes.
Climate: Known as the driest place on Earth, with some areas having never recorded rain. It is a “cold desert” climate, with temperatures generally mild year-round.
Atmospheric Conditions: Exceptional clarity due to high altitude (many areas over 4,000 meters), almost no cloud cover, low humidity, and lack of air pollution.
Astronomical Hub: Houses major international observatories, including the European Southern Observatory (ESO) at Paranal (home to the Very Large Telescope) and the Atacama Large Millimeter/submillimeter Array (ALMA).
The Future ELT: The Extremely Large Telescope (ELT), which will be the world’s largest optical telescope, is currently under construction in this region.

The Emerging Threat: Light Pollution (2026 Context)

Despite its remote nature, the Atacama’s “ocean of darkness” is threatened by:
Industrial Mining Activities: The extraction of lithium (a booming industry) and other minerals has increased light pollution in remote areas.
Urban Sprawl & Infrastructure: Increased industrial presence, traffic, and housing are bringing artificial light into previously unlit areas.
Energy Projects: Even green energy projects, such as wind farms, are introducing light pollution near sensitive, world-class observatories like Paranal.