when were rockets created

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
when were rockets created	0.02	0.7	8396	2	25
when	0.95	0.4	6949	39	4
were	0.2	0.4	5955	34	4
rockets	1.14	0.9	4496	99	7
created	1.53	0.3	1212	73	7

Keyword	CPC	PCC	Volume	Score
when were rockets created	1.26	0.5	3058	71
when were rockets first used	0.29	1	5058	44
when was the first rocket created	1.42	0.5	6660	76
how rockets were developed	1.02	0.9	8571	43
history of us rockets	1.42	0.9	2073	2
when was the first rocket made	1.47	0.8	416	17
when the rocket built	0.53	0.4	1218	5
when was the first rocket invented	1.85	0.9	736	13
when were rockets first used in war	1.26	0.6	7693	70
when were rockets first used on planes	1.33	0.9	8525	16
for what were the first rockets used	0.46	0.8	7234	86
where were rockets first used in europe	1.46	0.6	1280	19
the first rockets were used for	0.41	0.9	9851	21
aerial rockets were first used during	1.47	0.2	6849	45