Answer:
Frequency of soundwaves
Slower soundwave frequencies make lower pitched sounds, and faster soundwave frequencies make higher pitched sounds.
You get to be federal people grand 4 times
Contour Lines.
A perceived line that marks the edge of a figure as it curves back into space. Contour lines are created by the edges of things. Contour lines are lines that surround and define the edges of a subject, giving it shape and volume
Its a tricky one but i think its true
