The out edge of a cup is called the 'Rim'.
It is called a side or edge.
Called a straight edge
brim
An edge.
For social studies i know the answer is called a boundary
cresent crescent
cresent crescent
That would be a cresent moon.
cresent crescent
That would be a cresent moon.
That would be a cresent moon.
That would be a cresent moon.
That would be a cresent moon.
The region of a country bordering on another or a line, barrier, etc., marking such a border is called a frontier. A frontier is also the edge of the settled area of a country.
When the light source is moved farther away, the fuzzy region around the edge of the central region will decrease in size. This is because the light rays spread out less as they travel a greater distance, resulting in a sharper shadow edge.
A leaf's edge is called its margin.