Numerical Problems: a A person shouts loudly at the mouth of a well facing towards the water. The echo is heard clearly after 0.2 seconds. What is the distance between the person and the surface of water? [Velocity of sound in air = 332 m/s]

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).

c. is the answer

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