Clouds are the visible mass of condensed water vapour floating in the atmosphere, typically high above the general level of the ground. They cool the earth by reflecting sunlight back out to space. They play an important role in the energy balance of earth. When water on land or in the ocean evaporates- turns from a liquid to water vapour – it rises. The water vapour cools and turns back into a liquid in the shape of tiny droplets. The result is clouds, unless they are on the ground- then we call them fog. When enough droplets get together they fall to the ground as rain or if they are very cold, they freeze and fall down as snow, sleet or hail.
Clouds are put into different categories according to their shape, how high they are in the sky, their size, how fast and in what direction they are moving, etc. Here, based on form there are mainly four types of clouds.
Cirrus clouds:- They are white in colour and seen like bundles of feathers. These clouds are in the upper atmosphere in clear weather conditions.
Stratus clouds:- They are seen as white sheets in horizontal planes. These appear in thick layers in the lower part of the sky.
Cumulus clouds:- They are seen like ash coloured tall mounts. These clouds resemble huge cotton bundles.
Nimbus clouds:- These are rain bearing clouds. These clouds, seen in dark colour are spread over the lower levels of the atmosphere.
Rain is liquid water in the form of droplets that have condensed from atmospheric water vapour and then precipitated. Rain is a major component of the water cycle and is responsible for depositing most of the fresh water on earth. It provides suitable conditions for many types of ecosystems, as well as water for hydroelectric power, plants and crop irrigation.
THE BLUE PLANET
Planet earth has been called the ‘Blue Planet’ due to the abundant water on its surface.
However, liquid water is a rare commodity in our solar system.
ബാബരി മസ്ജിദ് തകര്ക്കുന്നതില് പങ്കാളി; ഇപ്പോള് ജീവിതം പള്ളികള്ക്കൊപ്പം, കേള്ക്കണം, മുന് കര്സേവകിന്റെ ജീവിതകഥ