Rain – Short Essay 1
Rain refers to water that appears in droplets form as a result of condensation from the water appearing in the atmosphere. This water accumulates a lot of weight thus falling to the earth’s surface under the influence of gravitation power.
Rain is a major source of water to the inhabitants of the earth, and it also plays a major role in ensuring the water cycle is complete. Rain facilitates the growth of various kinds of plants as well as the survival of animals.
Water collected from rain can also be used in the production of hydro-power used in manufacturing industries as well as the supply of energy to homes.
The clouds are made up of countless small drops of moisture which later enlarges to form raindrops. The raindrops are of various sizes depending on whether there is a thunderstorm. Evaporation usually takes place at the bottom of the cloud. Dry and warm air makes the clouds to condense thus leading to rainfall.
The amount of rainfall is measured by an instrument known as a rain gauge which is calibrated in millimeters. The information can be collected on a daily basis as well as annually depending on the kind of observation under investigation.
Factors Affecting Rain
A few examples of the factors affecting rain are as follows:
Rain and Geography
Rain and geography are strongly linked together. The equatorial region has a lot of rain forests. Here it rains almost throughout the year and hence the rain forests are always green. In Polar Regions and certain desserts, it rains very little or none at all. In many other regions of the world, it rains in the Monsoon season, between the summer and the winter.
Rain and Agriculture
Rain is a strong determinant for good agriculture in many countries of the world. Rainwater is the primary source of irrigation for the field crops. So agriculture cycles are planned around the rainy season.
Rain and Cities
Rain in the big cities is considered a hindrance to modern life. People have to prepare themselves to protect them from rain while going to work. Heavy rains cause traffic jams and can disrupt the economic cycle of big cities.
Rain and Mountains
Rain intensity is affected heavily by mountains. The rain clouds are stopped in their path by tall mountains like the Himalayas, and it affects the intensity of rain before and beyond the mountains in the path of the rain clouds.
Rain and geography are heavily interdependent, each affecting the other. The climate of a place plays a major role in determining the amount of rainfall to be experienced in that place. Deserts are less likely to experience rains as compared to highlands and forest areas.
Rain – Short Essay 2
Introduction and meaning: Rain is the drops of water that fall on the earth from the cloud. Rainfall is defined as fall of innumerable drops of water (rain) at a time on the earth surface.
Causes of rain: Water from seas, ocean, river, lakes, canals, ponds etc. get vaporized due to the heat of the sun. This vapor rises up and comes in contact with cold air and condenses in the form of cloud.
When this cloud, is cooled further, it cannot float in space and falls down on the earth surface as rain by the gravitational attraction of the earth.
How rainfall is measured? The amount of rainfall at any place is measured by an instrument called rain-gauge. Rainfall is generally measured in inches or centimeters.
Rainfall on the surface of the earth may be classified into three kinds according to the causes of origin, characteristics and nature. There are:
Convectional rainfall: Intense heating of the surface of the earth during daytime, makes the air hot that is in close contact to the earth’s surface. This hot air expands in mass, becomes lighter and rises upward. The rising mass of air progressively losses the heat in the appear layer of atmosphere where it cools up and is condensed thereby generating heavy shower often in the afternoon and evening when temperature reduces remarkably. Such a kind of rainfall found during evening and afternoon of summer season, restricted to a certain particular locality is defined as convectional rainfall. This type of rain is very common during afternoon in equatorial region.
Orographic rainfall: When flow of humid air coming from the sea is obstructed obliquely by a mountain, the air gets up sliding along the slant of the mountain and being cooled and condensed it causes rainfall on the windward slant. Such rainfall is known as Orographic Rainfall. In the state of Meghalaya such rainfall occurs at Cherapunji and Mousinram.
Cyclonic rainfall: Rainfall caused by cyclone is known as Cyclonic rainfall. Generally, when hot humid air and cold air, moving parallel to the earth surface, approach each other, the hot air rises above the cold air and causes cyclone. Mainly in temperate region such cyclone occurs.