created oxygen in the early atmosphere

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
created oxygen in the early atmosphere	1.34	0.1	6048	76	38
created	0.47	0.1	5265	85	7
oxygen	0.1	0.6	3167	77	6
in	0.82	0.3	8451	93	2
the	0.09	0.7	7906	58	3
early	1.86	0.1	8345	6	5
atmosphere	1.46	0.9	811	71	10

Keyword	CPC	PCC	Volume	Score
what created oxygen in the early atmosphere	1.21	0.9	1638	75
when did oxygen start in the atmosphere	0.2	0.7	8961	10
was oxygen present in the early atmosphere	1.45	0.1	1824	2
who introduced oxygen to the atmosphere	0.15	0.2	3420	15
when did oxygen appear in the atmosphere	1.53	0.3	5526	24
how was oxygen in the atmosphere produced	1.9	1	7570	71
when was oxygen discovered in the atmosphere	0.46	0.6	7767	23
when did the atmosphere become oxygenated	0.51	0.4	4649	45
oxygen in atmosphere has been formed by	0.65	0.1	8025	48
what created oxygen on earth	1.56	0.4	386	27
when was the oxygenation of the atmosphere	0.17	1	7468	44
how did oxygen first enter earth's atmosphere	0.67	0.4	1883	73
where did atmospheric oxygen come from	1.43	0.5	8974	76
how did oxygen enter the atmosphere	1.49	0.3	6584	22
how was oxygen created	1.76	0.3	3882	95
the first oxygen on earth came from	0.43	0.7	6127	62
how did oxygen originate on earth	1.84	0.3	4088	72
origin of oxygen on earth	1.96	0.2	5150	21
when did oxygen form	1.18	0.1	8268	27
how did oxygen accumulate in the atmosphere	0.1	0.5	6960	41