sources of oxygen on earth

Sources of Oxygen - Oxygen is the most abundant of all elements in the crust of the earth. It is present in sand and rocks in the form of silicon dioxide, and in most of the common compounds like oxides, carbonates, nitrates, etc. It is also present in air, w..

Oxygen is the most abundant of all elements in the crust of the earth. It is present in sand and rocks in the form of silicon dioxide, and in most of the common compounds like oxides, carbonates, nitrates, etc. It is also present in air, water and land as organic compounds..

Distribution of various elements in the Earth's crust Water is one of the most abundant compounds on Earth, hence sea water is a vast source of a large number of elements. The Earth's atmosphere contains mainly nitrogen (78%), oxygen (21%), and othe..

. Beneath the crust is hot rock. A ball of molten metal lies at the center of the earth. The earth ranks fifth in size among the planets. It has a diameter of about 13,000 kilometers. The earth is about 150 million kilometers from the sun. The atmosphere of the ea..

Sewage that includes organic matter, animal and human excreta-one of the major pollutants of water in the urban and rural areas is the sewage. The sewage most often contains the organic matter that encourages the growth of microorganisms. These organisms besides spreading diseases also consume the..

1) Major source of carbon for the living world is carbon dioxide. Atmosphere contains about 700 x 10 9 metric tonnes of carbon dioxide while ocean water contains about 35,000 x 10 9 metric tonnes of carbon dioxide. 2) Carbonates of earth's crust derived from rocks, ..

Oxygen - Oxygen is very essential for the existence of human life on Earth. It is the most abundant element on the surface of the Earth. In a free state, it is present in the Earth's atmosphere to an extent of about 21% by volume, (23.15% by mass) I..

Main source of oxygen are the plants which evolve oxygen as a by-product of photosynthesis. It is used chiefly by most of the living organisms in their aerobic respiration except certain anaerobics. Oxygen acts as a limiting factor in the distribution of ani..

Fig: 10.1 - Earth structure according to (a) Goldschmidt (b) Kuhn and Rittman Layer Elements present Metallic core (Siderophil) Mn, Fe, Co, Ni, Cu, Ru, Rh, Pd, Ag, Re, Os, Ir, Pt, Au Sulphide layer (Chalcophil) P, S, Zn, Ga, Ge, As, Se, Cd, In, Sn, Sb, Te, Hg, Tl, Pb, Bi Silicate layer (L..

Sun is a natural source of energy. Solar heat energy is essential for the survival of all forms of life on earth. Solar energy is considered as an alternate source of energ..