1.

Among the following sedimentary rocks, which one is of organic origin ?

Answer»

Gypsum
Limestone
Nitre
Rock salt

Solution :Due to erosian of earth's crust caused by WATER, AIR and carbondioxide, the sedimentry materials (MUCH as clay, sand and mud) were produced. The materials deposited in rivers, lakes and OCEANS which results in the formation of sedimentary rocks such as lime stone CHALK and sand stone.


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