American sculptors carol mickett and robert stackhouse created the work in the blue (crest) to imply the presence of water. the work’s many empty spaces, which were created using irregular horizontal members, are an example of volume.

open

Explanation:

Open volume is when artists create an object that is not solid and have spaces on it and these spaces are an important part of this type of creation. According to this, the answer is that the work’s many empty spaces, which were created using irregular horizontal members, are an example of open volume because the work of Carol Mickett and Robert Stackhouse has empty spaces.

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).

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