how do we know earth is 4.6 billion years old

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
how do we know earth is 4.6 billion years old	0.88	0.7	299	31	45
how	0.62	0.5	3642	8	3
do	0.63	0.1	27	93	2
we	1.27	0.7	2008	79	2
know	0.07	0.7	2291	76	4
earth	1.59	0.8	6847	3	5
is	0.89	0.4	5167	70	2
4.6	0.75	0.1	2805	96	3
billion	1.82	0.4	8833	83	7
years	1.49	0.4	5797	73	5
old	1.04	1	5825	50	3

Keyword	CPC	PCC	Volume	Score
how do we know earth is 4.6 billion years old	1.2	0.5	1721	50
how old is earth 4.6 billion years	1.62	0.1	1209	64
earth is 4.5 billion years old	1.64	0.8	4112	38
earth is about 4.6 years old	0.47	0.7	1509	87
earth is approximately 4.6 years old	1.19	0.3	7599	22
earth 4.543 billion years old	0.15	0.7	2167	31
the earth is 14 billion years old	1.01	0.1	6558	85
says earth is billions of years old	1.69	0.2	1316	8
the earth 4.6 billion years ago	1.3	0.7	9266	12
the earth is 4.6 million years	0.8	0.5	7894	48
is the earth 6 000 years old	0.32	0.4	8773	28
science showing earth is 6000 years old	0.16	0.9	4519	38
earth in 4 billion years	1.23	0.1	9293	14
the earth 4.5 billion years ago	0.6	1	2031	12
earth 4.4 billion years ago	1.63	0.2	6835	35
earth 4.54 billion years ago	0.46	0.5	3774	8
earth 4.6billion years ago	1.59	0.9	8359	85