In mathematical induction, showing that something works for the first case, or that P1 is true. angle of depression. The angle formed by a horizontal line and an observer's line of sight to an object below. angle of elevation. The angle formed by a horizontal line and an observer's line of sight to an object above.
Plankton's voice is provided by American actor Mr. Lawrence. The voice Lawrence uses for Plankton originated as an imitation of one of his deep-voiced friends from high school. On television, he first used the voice for incidental characters on Rocko's Modern Life.
He is voiced by actor Mr. Lawrence and first appeared in the episode Plankton! on July 31, 1999. Plankton was created and designed by marine biologist and cartoonist Stephen Hillenburg, the creator of the program, along with Lawrence.