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Primary on: actively promoting a particular cause or belief
A major factor is a primary cause, a large reason why something happens.
A faulty head gasket will cause power loss, coolant to mix with oil, and is a costly repair. Excessive heat is the primary cause for their failure.
no it wasn't the primary cause for the Enlightment
The primary cause of weather is the sun!
The primary cause of the Crusades was for the Christians to win back the "Holy Land."
A primary cause for surface winds on the earth is the Earths Rotation.
The primary cause of destruction of ozone layer is CFC's. They react with ozone to deplete it.
The primary cause of urbanization is jobs or the growth of industry. People will move to where they can find work.
cause it is
The Major Cause of the Global Crisis
The primary cause in change to the Earth's weather is variation in solar energy received by the Earth's regions.