Physiographic divisions of India

Physiographic regions are defined on the basis of characteristics of landforms. These are basically the demarcation and description of regions from the viewpoint of geomorphology. India is divided into seven physiographic divisions namely

•   Northern Mountains and the North Eastern mountain range
•   The Indo Gangetic plain
•   Thar Desert
•   Central highlands and Peninsular plateau
•   East Coast 
•   West Coast
•   Islands


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WHY DO EARTHQUAKES HAPPEN

WHY DO EARTHQUAKES HAPPEN
The entire surface of the earth is made up of several wide, thin and rigid plate like blocks. These are in constant motion with respect to each other. This causes most earthquakes at edges of plates and a few earthquakes within the plate. The movement is very slow but in some places it is as much as about 5 cm per year. Earthquakes occur almost everywhere in the world. Some regions have more earthquakes than other parts of the globe. Earthquakes can be caused by other reasons too. Volcanic activity can shake the ground. Blasting, quarrying and mining can cause small earthquakes. Underground nuclear explosions are also man made earthquakes.        Tremendous amount of energy is released during an earthquake. This can cause widespread damage. Human dwellings have to be protected from earthquakes. Collapse of buildings in  an earthquake, specially in congested
areas, can cause havoc.

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The Troposphere

The Troposphere

The troposphere is where all weather takes place; it is the region of rising and falling packets of air. The air pressure at the top of the troposphere is only 10% of that at sea level (0.1 atmospheres). There is a thin buffer zone between the troposphere and the next layer called the tropopause.

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GIS

A geographic information system (GIS), geographical information system, or geospatial information system is the system that captures, stores, analyzes, manages, and presents data with reference to geographic location data. In the simplest terms, GIS is the merging of cartography, statistical analysis, and database technology.

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Condensation

Condensation occurs when water vapor changes to a liquid. For condensation to take place, the air must be saturated and there must be a surface on which the vapor can condense. In the air above the ground, tiny hygroscopic (water-absorbent) particles known as condensation nuclei serve as the surfaces on which water vapor can condense.



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Types of Rainfall

There are three types of Rain:

1- Relief
2- Convectional
3- Frontal

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Remote Sensing Satellites

Remote Sensing Satellites:
Remote sensing is observing and measuring our environment from a distance. So, remote sensing satellites are usually put into space to monitor resources important for humans. For example, remote sensing satellites might track animal migration, locate mineral deposits, watch agricultural crops for weather damage, or see how fast the forests are being cut down.
All of these things can be done best from space because a satellite in orbit can normally take photographs of large expanses of land all over the world. Since these satellites are able to take photographs and observe areas all over the globe, the satellite is able to monitor areas in which the climate is very harsh, or which are nearly impossible tor reach by land.

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