(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) 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

Based on carbon content, it is classified into the following types.
(i) Anthracite: contains 80 to 90% carbon
(ii) Bituminous: contains 60 to 80% carbon
(iii) Lignite: contains 40 to 60% carbon
(iv) Peat: contains less than 40% carbon

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.

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

a) Any matter or energy derived from the environment that is used by living things including humans is called a natural resource.
b) The two types of resources are Renewable resources and Non-renewable resources.

i) Textile is a broad term which includes cotton, jute, wool, silk and synthetic fibre textiles.
ii) This sector in India is the second largest in the world.
iii) Traditional sectors like handloom, handicrafts and small power loom units are the biggest sources of employment.
iv) Currently, India is the third largest producer of cotton and has the largest loom are and ring spindles in the world.
In India:
i) At present, cotton textile industry is the largest organised modern industry of India.
ii) The highest concentration of textile mills in and around Mumbai, makes it as 'Manchester of India'.
iii) The major cotton textile industries are concentrated in the states of Maharashtra, Gujarat, West Bengal, Uttar Pradesh and Tamil Nadu.
In Tamil Nadu:
i) Coimbatore is the most important centre in Tamil Nadu with 200 mills out of its 435 and hence called as "Manchester of South India".
ii) Erode, Tirupur, Karur, Chennai, Tirunelveli, Madurai, Thoothukudi, Salem and Virudhunagar are the other major cotton textile centres in the state.