Solar and Lunar Eclipse

An eclipse is the partial or total blocking of the light of one object by another.  In the solar system, relative positions of the Sun, Moon, and Earth create solar eclipses and lunar eclipses. Frequency of Eclipses Perfect alignments of ..

Latitudes and Longitudes

Eratosthenes was the first person to calculate the size of the earth. He realized that Earth could be located with a basic grid of lines called Longitudes and Latitudes. Great Circle When a sphere is divided exactly in half through ..

Earth’s Revolution: Equinox, Solstice, Seasons, Perihelion and Aphelion

The orbit of the Earth is the motion of the Earth around the Sun every 365.242199 mean solar days. The orbital speed of Earth around the Sun averages about 30 kilometre per second or 108,000 kilometers per hour.  This speed ..

{Geography} Earth’s Rotation and Solar Day

Earth rotates around its own axis from west to east. When seen from the North Star Polaris {Alpha Ursae Minoris}, Earth turns counter-clockwise. Rotation of Earth results in days and nights. Earth’s rotation is mostly the result of angular momentum ..

Soil Classification: Types of Soils

Soil classification based on observable soil properties actually seen in the field is known as soil taxonomy. There are a number of soil classifications presented by the experts of soil science. The major types of the soils have been discussed ..

General Knowledge of Soil: Nature, Texture, Soil pH and Soil Horizons

The fine particles of the solid rocks along with the organic / inorganic matter are called soil.  The naturally occurring soil is influenced by parent material, climate, relief and the physical, chemical and biological agents such as microorganisms living in ..

Tornado: Meaning, Formation and Impacts

Basically, hurricanes and typhoons form over water and are huge, while tornados form over land and are much smaller in size. A tornado is a violent windstorm characterized by a twisting, funnel-shaped cloud. In the United States, twister is used ..

Cyclones: Types and Mechanism

Cyclone is a system of low atmospheric pressure in which the barometric gradient is steep. Cyclones represent circular fluid motion rotating in the same direction as the Earth. This means that the inward spiralling winds in a cyclone rotate anticlockwise ..

Frontogenesis and Frontolysis; Cold, Warm and Occluded Fronts

Air mass is a volume of air defined by its temperature and water vapour content. An air mass may be of many hundreds or thousands of square miles, and adopt the characteristics of the surface below them. An air mass ..

Types of Rainfall: Convectional, Frontal, Orographic Rainfall

The amount of moisture in air is commonly recorded as relative humidity; which is the percentage of the total water vapour air can hold at a particular air temperature. The presence of warm, moist and unstable air and sufficient amount ..