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Conservation Laws
A conservation law is a hypothesis based on observation and experiments which cannot be proved. These can be verified via experiments.
Law of conservation of Energy
- According to the general Law of conservation of energy, the energies remain constant over time and convert from one form to another.
- The law of conservation of energy applies to the whole universe and it is believed that the total energy of the universe remains unchanged.
- Under identical conditions, the nature produces symmetric results at different time.
Law of conservation of Mass
This is a principle used in analysis of chemical reactions.
- A chemical reaction is basically a rearrangement of atoms among different molecules.
- If the total binding energy of the reacting molecules is less than the total binding energy of the product molecules, the difference appears as heat and the reaction is exothermic.
- The opposite is true for energy absorbing (endothermic) reactions.
- Since the atoms are merely rearranged but not destroyed, the total mass of the reactants is the same as the total mass of the products in a chemical reaction.
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Troposphere
It is the undermost layer of the earth’s atmosphere. At the base of the troposphere, the air is warmer. Density and air pressure also decrease with altitude.
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Theory of plate tectonics lays down that the crust of the Earth has been formed out of seven major and some minor plates. The movement of plates beneath the surface of the Earth creates tension resulting into folding, faulting and volcanic activities.
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Systematic geography: A study of specific natural or human phenomenon that gives rise to certain spatial patterns and structures on the earth surface is called systematic study. Generally, systematic geography is divided into four main branches.
Physical geography: It describes about the earth systems like atmosphere (air), the hydrosphere (water), the lithosphere (earth solid rock) and biosphere, which comprises all of earth’s living organisms.
Biogeography, including environmental geography: It focuses on various kinds of forests, grasslands, distribution of flora and fauna, human nature relationships and the quality of the living environment and its implications for human welfare.
Human geography: It describes culture, populations, dynamics of social, economic, and political aspects of space.
Geographical methods and techniques : It deals with methods and techniques for field studies, qualitative quantitative and cartographic analysis, Geographic Information System and Global positioning system (GIS and GPS) and remote sensing.
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