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Meghna Thapar 5 years, 9 months ago
Oxygen is required by all living beings for respiration and for burning materials. This is balanced by green plants. Green plants take in carbon dioxide and release oxygen during the process of photosynthesis. Hence, the gases become balanced in the atmosphere.
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Yogita Ingle 5 years, 9 months ago
According to thermodynamic systems, heat transfer is defined as
The movement of heat across the border of the system due to a difference in temperature between the system and its surroundings.
Interestingly, the difference in temperature is said to be a ‘potential’ that causes the transfer of heat from one point to another. Besides, heat is also known as flux.
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Yogita Ingle 5 years, 9 months ago
Resources such as land, labour and capital are limited in relation to their demand and economy cannot not produce all that people required to satisfy themselves. This is why the existence of economic problems in an economy. Scarcity is universal which is applicable to all individuals, institutions and economy as a whole. If there is abundant or sufficient resources then there will not be any problem in an economy. Hence, scarcity leads to economic problem.
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Yogita Ingle 5 years, 9 months ago
Industries are divided into three broad categories namely primary, secondary and tertiary.
(i) Primary Industries They include all those activities which are connected with extraction and production of natural resources and reproduction and development of living organisms, plants, etc.
These industries are subdivided into two types
(a) Extractive Industries They are involved in extraction of products from natural resources. For example, wood from forests, fish from rivers and minerals from earth.
(b) Genetic. Industries They include activities connected with rearing and breeding of animals and birds and growing plants. For example, agricultural activities, animal husbandry, dairy farming, poultry farming, etc.
(ii) Secondary Industries They are concerned with the further processing of materials which have already been extracted at the primary stage. For example, the mining of an iron ore is a primary industry but manufacturing of steel from that iron is secondary.
Secondary industries may be of two types
(a) Manufacturing Industries They convert raw materials into finished products like cotton into textiles, wood into furniture or iron into steel.
(b) Construction Industries Activities concerned with the construction of houses, roads, bridges, dams, seaports, etc belong to the category of construction industies. The main feature of these activities is that the output consists of immovable goods.
(iii) Tertiary Industries They are concerned with providing support services to primary and secondary industries as well as activities related to trade. For example, transportation, banking, insurance, warehousing, etc.
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Davinder Singh 5 years, 9 months ago
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