Word:

Primary rocks

(Geol.) a term early used for rocks supposed to have been first formed, being crystalline and containing no organic remains, as granite, gneiss, etc.; - called also primitive rocks. The terms Secondary, Tertiary, and Quaternary rocks have also been used in like manner, but of these the last two only are now in use.

See also: Primary

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Primary Domain Controller
primary dysmenorrhea
primary election
Primary evidence
primary feather
primary health care
primary key
primary management domain
Primary meeting
Primary pinna
Primary planets
Primary powers
Primary qualities of bodies
primary quill
Primary quills
Primary Rate Interface
-- Primary rocks --
Primary root
Primary salt
primary school
Primary Sclerosing Cholangitis
primary sex character
primary sex characteristic
primary solid solution
primary syphilis
primary tooth
Primary union
primary winding
Primate
Primates
Primateship
Primatial
Primatical
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