Keyword Analysis & Research: why is it called piggy back ride

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
why is it called piggy back ride	0.6	0.8	385	13	32
why	1.47	0.2	4017	34	3
is	0.49	0.9	5108	35	2
it	0.85	0.4	2974	44	2
called	0.84	0.4	7601	99	6
piggy	0.41	1	3257	95	5
back	0.39	0.2	2924	56	4
ride	0.29	0.2	2783	44	4

Keyword	CPC	PCC	Volume	Score
why is it called piggy back ride	1.68	0.8	9217	15