Explanation

• An Erograph is a diagram used in agriculture.
• It shows the relationship between crops and their growing seasons.
• It represents sowing, growing, and harvesting periods in a year.
• Helps in understanding cropping patterns and agricultural planning.

Last verified on 01-05-2026

Explanation

• Lake Baikal is the world’s deepest freshwater lake.
• Its water flows out through the Angara River.
• The Angara River is a tributary of the Yenisei River.
• Therefore, Lake Baikal ultimately drains into the Yenisei system.
• It is often called an “inland sea” due to its huge size.

Last verified on 01-05-2026

Explanation

The Danube River flows through 7 European countries.

1. Germany
2. Austria
3. Slovakia
4. Hungary
5. Croatia
6. Serbia
7. Romania

It is the second-longest river in Europe after the Volga.

• It passes through major cities like Vienna, Budapest, and Belgrade.
• It ultimately drains into the Black Sea.

Last verified on 01-05-2026

Explanation

• The Kuroshio Current is a warm ocean current in the Pacific Ocean.
• It flows northward along the eastern coasts of Asia.
• It is also called the Japan Current.
• It raises temperature and affects climate of nearby regions.
• It is similar to the Gulf Stream in the Atlantic Ocean.

Last verified on 01-05-2026

Explanation

• A seamount is a submarine volcanic mountain rising more than 1000 meters above the ocean floor.
• It is formed by volcanic activity under the sea.
• Most seamounts do not reach the ocean surface.
• If flattened at the top, it may become a guyot.
• They are common in the Pacific Ocean basin.

Last verified on 01-05-2026

Explanation

• Isohypses are lines joining equal points of altitude.
• They are used to show height above sea level on maps.
• Also called contour lines.
• Help in understanding relief and terrain shape.
• Common in topographic maps.

Last verified on 01-05-2026

Explanation

• A thematic map shows a specific theme or subject.
• It focuses on one type of information like population, climate, or resources.
• It is a type of special purpose map.

Last verified on 01-05-2026

Explanation

• Ozone (O₃) is mainly found in the Stratosphere, called the ozone layer.
• It absorbs harmful ultraviolet (UV) radiation from the sun, protecting life on Earth.
• Located roughly 15–35 km above the Earth’s surface.

Last verified on 17-01-2026

Explanation

• The stratosphere is heated mainly by ozone.
• Ozone layer absorbs harmful ultraviolet (UV) radiation from the Sun.
• This absorption converts solar energy into heat.
• It causes warming in the stratosphere instead of cooling.
• This layer protects Earth from dangerous UV rays.

Last verified on 01-05-2026

Explanation

• Hydrogen (H2) and Argon is not a greenhouse gas.
• Greenhouse gases are gases that trap heat in Earth’s atmosphere and cause the Greenhouse Effect.

The main greenhouse gases are:

• Carbon dioxide (CO2)
• Methane (CH4)
• Nitrous oxide (N2O)
• Water vapor (H2O)
• Ozone (O3)
• Chlorofluorocarbons (CFCs)
• Hydrofluorocarbons (HFCs)
• Perfluorocarbons (PFCs)

Last verified on 01-05-2026