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class eighth Science cbse ncert solution

Microorganisms: Friend and Foe

Living organisms which cannot be seen without using microscope, are called microogranisms...

Materials: Metals and Non-Metals

Everything around us is called material. For example tree, water, gas, table, chair, iron, comput...

Coal and Petroleum

Natural Resources can be divided into two types in the light of their availability. These two typ...

Combustion and Flame

Combustion: A chemical process in which a substance reacts with oxygen to give o...

Conservation of Plants and Animals

Conservation is the protection of species from their extinction. Conserv...