It was launched because India wanted to compete with other Lunar exploration's orginisation.

Glacial lake - 1. From glacial region

2. Eg. Mansarovar lake

Tectonic lake - 1. From fractures and Faults in earth crust

2. Eg. Wular lake and Dal lake.

Lagoon lake - 1. From deposition of sandbars.

2. Eg. Chilika, pulicat

Man made lakes - 1. Formed when rivers are demand for generation of electricity.

2. Eg. GobindSagar

Dutch did not rule India like other European powers however they maintained few ports for trade purposes. In Malabar Coast (Kerala) they held Cochin, Quilon (Kollam), Cranganore (Kodungallur) and Cannanore (Kannur). In Tamil Nadu they held Pulicat (Pazhaverkadu), Tuticorin (Thoothukudi) and Nagapattinam. In Bengal they held few factories at Pipley, Hougli, Patna, Baleshwar and Murshidabad. Basically patches of port villages. Cochin can be considered as enclave.

Chennai, originally known as Chennapatnam. In honour of Damerla Chennappa Nayakudu, father of Venkatadri Nayakudu, who controlled the entire coastal country from Pulicat in the north to thePortuguese settlement of Santhome , the settlement which had grown up around Fort St. George was named after him as Chennapattanam.

After that british named it as madras to honour a person called madura

(local chennaite) who helped them.

After a long period of bearing the name of madras it was decided to change it back to chennai by the CM of TamilNadu.