Life Expectancy and Average Human Lifespan: How Long Do People Live?
Learn what is life expectancy, how to calculate it and factors affecting it. We discuss the average human lifespan in countries around the world.
Temperature Inversion: Meaning, Definition, Causes, Effects and Diagram
Learn what is temperature inversion. We explain its meaning and definition as well as its causes, effects and types with the help of diagram.
Heat Budget of Earth and Oceans: Variation with Latitude
Learn what is heat budget of earth and how heat balance is maintained by various factors. We also explain heat surplus and heat deficit regions.
Earth System Spheres: Layers and Their Interactions
Learn about Earth system which composed of four spheres called lithosphere, hydrosphere, biosphere, and atmosphere and their interactions.
Atmospheric Pressure: Measurement and Effect of Altitude, Density etc.
Learn what is atmospheric pressure and how to measure it. We also discuss how density, altitude and temperature affect this pressure.
Earth’s Atmosphere: Layers, Composition and Formation
Learn what is atmosphere and composition of earth’s atmosphere. We also discuss the formation and layers of the earth’s atmosphere.
Seasons on Earth: Causes, Types, Classification, Effect & Diagram
What is a season? Learn what causes seasons on Earth. We discuss types and classification of seasons and their effects.
Coral Bleaching: Meaning, Causes and Effects
Learn what is coral bleaching and what causes it. We discuss the effects of coral bleaching and how climate change is affecting it.
World Savings Day (Thrift Day): Meaning, History, Theme, Posters & Quotes
Learn about the World Savings Day (aka World Thrift Day) observed on 31 October. We explain the history, importance and theme. Also get some interesting quotes of savings day.
Wind: Meaning, Direction, Speed & Global Wind Pattern & Map
Learn about the definition and meaning of wind. We also explain wind speed, wind direction and factors affecting these phenomena.
Time Zones of the Earth: Map and How to do Calculation
Learn about definition of time zone and how to calculate it. We explain Universal Coordinated Time and Greenwich Mean Time as well.
United Nations Day: Quotes & Messages
Important quotes about the importance of the United Nations. You can use these quotes as messages and status on the UN Day.
United Nations Day: Objective, History, Theme, Significance & Quotes
The United Nations Day is celebrated on 24 October. We explain the objectives, theme, history and significance of the UN Day.
Mole Day: Significance, History, Theme, Activities & Projects
Learn about the Mole Day and the meaning behind it. We explain its significance, history, theme, activities and projects associated with it.
Top 25 Most Populous (Crowded!) Cities in the World
List of the world’s most crowded cities. This list of most populous cities include Tokyo, Delhi, Shanghai, Mumbai, Cairo, Dhaka, Karachi etc.
Top 25 Most Populous Countries in the World
List of top 25 most populous countries in the world and their respective population.
Speed vs Velocity: Differences in Tabular Form with Diagrams and Examples
Learn the differences between velocity and speed. We present speed verses velocity in terms of definition, units, formula; along with examples and diagrams.
Trade Winds: Definition, Cause, Direction, Map, Impact & Important Facts
Learn about Trade Winds definition, meaning and their direction on map. We explain the impact of Hadley Cell and Coriolis Effect as causes of these winds.
What is Mid-Ocean Ridge? Important Facts and Features
Learn definition of mid-ocean ridge system and its location on world map. Also get the list of major active ridges and associated volcanoes.
E = mc^2 : The World’s Most Famous Equation
Learn about E = mc^2 or the energy-mass equivalence equation. Multiplying mass with the speed of light squared gives us equivalent energy.