What is the significance and structure of a stupa?

The stupa (“stupa” is Sanskrit for heap) is an important form of Buddhist architecture, though it predates Buddhism. It is generally considered to be a sepulchral monument—a place of burial or a receptacle for religious objects. At its simplest, a stupa is a dirt burial mound faced with stone.

Explanation:

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I dont know the answer. and the person on top of me was wrong so just try

"Stupas. The basic structure of a stupa is a square foundation with a rounded dome, but each part of the structure has a symbolic meaning. The foundation, for example, represents the earth, the dome symbolizes water, and 13 steps symbolize the process of enlightenment and the element of fire."

Explanation: dont blame me if its wrong. better to try than copy paste the top persons answer.

option c (nickel) is not found in earth's crust. the earth's crust basically contains eight (8) elements namely: oxygen, silicon, aluminum, iron, calcium, sodium, potassium and magnesium (listed in order of abundance).