The Origin and Evolution of Earth Origin of Earth When the solar system settled into its current layout about 4.5 billion years ago, Earth formed when gravity pulled swirling gas and dust in to become the third planet from the Sun. Earth has a central core, a rocky mantle, and Read more…
Solar Radiation, Heat Balance, and Temperature Solar Radiation Our earth receives almost all its energy from the sun in short wavelengths that are radiated back to space by the earth. As a result, the earth neither warms up nor does it get cooled over a period of time. The amount of Read more…
Agricultural systems in the world: A brief introduction of agricultural systems definition of Agriculture: Farming or agriculture is the practice of cultivating plants and livestock. It played a very important role in the development of human civilization. The development of agriculture enabled the human population to grow many times larger Read more…
Human geography: Nature and scope Human geography deals with the relationship between the physical/natural and the human worlds, the spatial distribution of human phenomena and how they come about, and the social and economic differences between different parts of the world. What is spatial distribution? Spatial distribution in statistics is Read more…
Continent Africa Introduction: Africa is the second largest continent in terms of area after Asia. It covers an area of 30,065,000 sq.km. It is also the second most populous continent after Asia. It covers 6% of Earth’s total area and 20% of its land area. The continent is surrounded by Read more…