The world's major industries are the iron and steel industry, the textile industry and the information technology industry.
1. Locations of iron and steel industry are:
 Germany, USA, China
2. Locations of textile industry are
India, Hong Kong, South Korea, Japan
3. Locations of information technology industry are
Silicon Valley of Central California, Bangalore region of India.

Iron and steel industry is located at Jamshedpur due to the following factors:
(i) Manganese is obtained from Keonjhar district of Odisha.
(ii) Well-developed network of transport is available.
(iii) Kolkata provides port facilities.
(iv) Cheap and skilled labour is available from the nearby states.

Similarities between information technology industry in Bangalore and California can be drawn as follows
1.Bangalore is located in Deccan.Plateau while Silicon Valley in California is located next to the Rocky mountains.
2.Both have clean environment.
3.Pleasant climate throughout the year.
4. In the vicinity of educational, scientific and technological centres.
5. Close to major roads and airports.
6.Good access to markets.
7. Both have skilled workforce.
8. Low or affordable cost of living.

1. Iron and steel industry is often referred to as the backbone of the modern industry. This is because almost everything is either made from iron or steel or has been made using tools and machineries of these metals.
2. There are plenty of examples like ships, trains, vehicles; all are made largely of steel. Materials of our day-to-day use starting from safety pin to our building in which we live, are made from steel. Without the use of iron, no industry can run.

Industry means an economic activity that is related to production of goods, extraction of minerals and the provision of services. Examples for the above are - iron and steel industry, coal mining industry and tourism industry, respectively.

Factors that helped the city to become a textile centre are:
i) Ahmedabad is situated in the heart of a cotton growing area, hence the major raw material is easily available.
ii) The humid climate is ideal for spinning and weaving.
iii) The flat terrain and easy availability of land is suitable for the establishment of the mills.
iv) The densely populated states of Gujarat and Maharashtra provide both skilled and semi-skilled labour.
v) The Mumbai port which is situated nearby facilitates import of machinery and export of cotton textiles.

The iron and steel is called basic industry because all other industries depend on it for their machinery.
Steel is needed to manufacture a variety of engineering goods, construction material, defense, medical, telephones, scientific equipment and variety of consumer goods.
Iron and steel is a heavy industry because all the raw materials and finished goods are heavy. They are bulky also. They are entailing heavy transportation costs.
Iron one and limestone are required in high quantity