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

Explanation

• The concept of Demographic Transition Theory (DTT) was developed by Frank W. Notestein.
• He introduced it in the 1940s.
• It explains population change from high birth & death rates to low birth & death rates.
• It is widely used in population geography and economics.
• The model describes development stages of societies.

Last verified on 01-05-2026

Explanation

• The concept of Location Triangle was introduced by Alfred Weber.
• He is known for Industrial Location Theory.
• It explains the best location for industry based on transport costs and raw materials.
• The triangle includes raw material source, market, and production site.
• It helps minimize industrial cost and maximize profit.

Last verified on 01-05-2026

Explanation

• Line-in-polygon overlay is used when a line feature (road) intersects a polygon (forest area).
• It helps calculate the portion or length of a line inside a polygon.
• In this case, roads are line features and forests are polygon features.
• So we use line-in-polygon analysis to measure road length within forest boundaries.
• It is widely used in GIS spatial analysis.

Last verified on 01-05-2026