The main centres of IT parks are located in Chennai, Coimbatore, Thiruvananthapuram, Bengaluru, Mysuru, Hyderabad, Visakhapatnam, Mumbai, Pune, Indore, Gandhi Nagar, Jaipur, Noida, Mohali and Srinagar

(i) Heavy electrical industries manufacture equipment used for power generation, transmission and utilization.
(ii) Turbines for steam and hydro power plants, boilers for thermal power plants, generators, transformers, switch gears etc. are the chief products of this industry.
(iii) The most important company in the field of heavy electrical is Bharat Heavy Electricals Ltd (BHEL). It has its plants at Hardwar, Bhopal, Hyderabad, Jammu, Bengaluru, Hansi and Tiruchirappalli.

(i) The Gas Authority of India Ltd [GAIL] is doing pioneer work in the field of natural gas exploration.
(ii) Discovery of gas made rapid strides in the 1985. Oil strikes at Cauvery offshore, at Nanda in Cambay basin and Tarot in Jaisalmer basin in Rajasthan were major discoveries during 1988-89.
(Iii) Recently, it has been found that Krishna- Godavari delta has reserves of Natural gas.

(i) Gypsum is a hydrated sulphate of calcium which occurs as white, opaque or transparent minerals in beds of sedimentary rocks such as limestone, sandstone and shale.
(ii) Gypsum is used in the manufacture of cement, fertilizers, wall board, plaster of paris and in soil conditioning.
(iii) The state of Rajasthan alone accounts for 81% of its reserves. 14% of its reserves is found in Jammu and Kashmir and 2% in Tamil nadu.
(iv) The remaining 3% resources are found in the states of Gujarat, Himachal Pradesh, Karnataka, Uttarakhand, Andhra Pradesh and Madhya Pradesh.

(i) Andhra Pradesh
(ii) Rajasthan
(iii) Odisha
(iv) Jharkhand

i) Mumbai high oil fields
ii) Gujarat coast
iii) Bassein oil field
iv) Aliabet oil field
v) Ankleshwar
vi) Cambay - Lumu region
vii) Ahmedabad - Kalol region

i) Natural gas is naturally occurring hydro carbon gas mixture consisting primarily of methane, but commonly includes varying amounts of other higher alkanes. Sometimes it includes at small percentage of carbon dioxide, nitrogen and hydrogen sulphides.
ii) It is formed when layers of decomposed plants and animals are exposed to intense heat and pressure over thousands of years.

Manganese is used in the manufacturing of iron and steel, bleaching powder, insecticides, paints and batteries.

Jharkhand, Odisha, Chhattisgarh, Karnataka, Andhra Pradesh and Tamil Nadu.