Explanation

• The River Thames flows through southern England.
• It passes through the city of London.
• It is also sometimes called the River Isis in its upper course.
• It is the second-longest river in the United Kingdom.

Additional information:

Major Rivers in the UK:

• River Severn – longest (~354 km)
• River Thames – ~346 km
• River Trent
• River Mersey
• River Clyde

Last verified on 03-05-2026

Explanation

• The term “Golden Triangle” was coined by Marshall Green in 1971
• Local Name: Sop Ruak. 
• Continent: Southeast Asia
• Region: Myanmar, Thailand, Laos
• Situated at the Ruak and Mekong rivers in Chiang Rai Province
• Large, mountainous region of approximately 200,000 km2 (77,000 sq mi)
• The largest opium-producing areas of the world since the 1950s.

Last updated question by NS on 2 MAY 2026

Explanation

• A massive explosion occurred on 4 August 2020 in Beirut.
• Beirut is the capital of Lebanon.
• Caused by improper storage of ammonium nitrate at the port.
• Resulted in 200+ deaths and thousands injured.
• One of the largest non-nuclear explosions in history.

Last verified on 02-05-2026

Explanation

• Ozone (O₃) is both beneficial and harmful depending on its location.
• In the Ozone Layer, it protects life by blocking UV rays.
• At ground level, it becomes a pollutant harmful to lungs and plants.
• Thus, it has a dual role in Earth’s atmosphere.

Last verified on 02-05-2026

Explanation

• The ozone hole is mainly caused by chlorofluorocarbons (CFCs).
• CFCs release chlorine atoms that destroy ozone molecules.
• This happens in the Ozone Layer.
• Major impact observed over Antarctica.
• Linked to human activities like refrigeration and aerosols.

Last verified on 02-05-2026