The plant produces a (great/large/huge) 'mass of' blossoms every spring. = The plant produces 'masses of' blossoms every spring.
The mayor is trying to encourage more commuters to use 'mass transit' in order to alleviate traffic in the city.
His policies are supported by 'the' (great/broad) 'mass of' the people. [=by most of the people]
(..) there are titanic stirrings. This is the Danakil Depression in Ethiopia, lying within a colossal rent of the earth's surface where giant land masses are pulling away from one another. Lava rises to the surface through this crack in the crust creating a chain of young volcanoes. (..)2006 TvShow: Planet Earth Title: Mountains Season: 1 Episode 2