Lectures are educational talks or long speeches.
Answer:
Etching
Explanation:
The method of making prints from a metal plate, usually copper.
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I searched up the lyrics and this is what it gave me hope this helps
A Circle is a two-dimensional figure whereas, a Sphere is a three-dimensional object. A circle has all points at the same distance from its centre along a plane, whereas in a sphere all the points are equidistant from the centre at any of the axes.