why is the average density of comets so low

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
why is the average density of comets so low	1.66	0.6	5171	2	43
why	1.42	0.3	8687	15	3
is	1.58	0.4	9643	18	2
the	0.22	0.7	5813	86	3
average	0.16	0.8	7910	99	7
density	1.36	0.5	2404	7	7
of	0.63	0.8	4069	44	2
comets	1.44	1	1748	69	6
so	1.93	0.9	5984	39	2
low	1.9	0.1	5947	28	3

Keyword	CPC	PCC	Volume	Score
why is the average density of comets so low	0.41	0.4	5190	36
density of a comet	0.38	1	5992	98
physical properties and composition of comet	1.46	0.5	4209	64
what characteristics do comets have in common	0.75	0.9	7339	10
how are comets characterized	0.45	0.3	4519	9
do comets have gravity	1.54	0.1	8884	43
how cold are comets	1.03	0.3	8981	83
density of a metal	0.97	1	3607	15
density of a metal formula	1.97	1	4448	79
density of a metal cylinder	1.81	0.7	6534	38
density of a compound	0.93	0.9	941	11
density of a meteorite	1.96	0.9	2187	44
density of a metal sphere	0.27	0.4	1007	37
density of a metal is high	1.31	0.2	3974	78
density of a metal calculator	1.38	0.7	8208	17
density of a composite	0.39	0.4	6979	35
density of a cone formula	0.9	0.7	6765	8
density of a cone	1.6	0.9	9214	28
density of a cork	1.09	0.4	7861	26
density of a copper	1.48	0.2	886	92
density of a coin	1.24	0.6	6219	24
which part of a comet has the highest density	0.89	0.2	4125	82