Explanation

• Contour lines on a map connect points that have the same elevation (height) above sea level.

Additional information:

• Isotherms: Connect points of equal temperature.
• Isohyets: Connect points of equal rainfall.
• Isobars: Connect points of equal atmospheric pressure.
• Isobaths: Connect points of equal water depth.

Last verified on 15-10-2026

Explanation

• GIS stands for Geographic Information System.
• It is a system designed to capture, store, manipulate, analyze, manage, and present geographic data.
• It is commonly used in urban planning, environmental science, and navigation.

Last verified on 12-11-2026

Explanation

• Halford Mackinder presented the Heartland Theory in 1904.
• He considered the interior of Eurasia strategically important.
• His theory connected control of the Heartland with wider global political power.

Last verified on 12-11-2026

Explanation

• The term Geography was first used by the Greek scholar Eratosthenes.
• He lived in the 3rd century BC (around 276–194 BC).
• He is also known as the “Father of Geography”.
• He calculated the circumference of the Earth with remarkable accuracy.
• His work laid the foundation of modern geographical studies.

Last verified on 02-05-2026

Explanation

• A Barometer is an instrument used to measure air (atmospheric) pressure.
• It helps in weather forecasting by measuring changes in atmospheric pressure.
• The mercury barometer is the oldest type of barometer.
• It was invented by Evangelista Torricelli in 1643.
• Barometers are widely used in meteorology and aviation.

Last verified on 09-07-2026