What is meant by 'remote sensing' ?
Mention any two applications of remote sensing.

Solution :Remote sensing is a technique of obtaining information about an object/area from a distance without having any physical contact.
Two types of satellites are USED for remote sensing.
`(i)` Passive satellites. A passive satellite is not equipped with electronic devices to process or amplify the signal. The signal is simply reflected BACK to earth, hence a very powerful transmitter is required.
`(ii)` Active satellite. Active satellites have high resolution cameras, infrared SCANNERS etc. These devices can record the information and them beamed down to earth in digital form which is them converted into maps and PICTURES by the computers.
Applications
`(i)` Remote sensing is used for geological surveys, water resource surveys, urban land USE survey and natural disaster surveys.
`(ii)` Remote sensing data is used in monitoring climate changes.
`(iii)` Remote sensing can be used to assess the damage caused by floods.