The stone seals of Harappan civilization are covered by

Most of the seals were made of steatite, which is a kind of soft stone. A few of them were also made of terracotta, gold, agate, chert, ivory and faience. The standard Harappan seal was square in shape with a 2X2 dimension. It is believed that the seals were used for commercial purposes

Explanation:

radiant energy is a form of kinetic energy only.(a)

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