The sugar maple, Acer saccharum.

Physically very solid; very difficult to move. / (figuratively) Very strong and dependable.

clear, colourless form of the silica-based mineral quartz, often called "pure quartz" or "clear quartz".

(informal) To progress in a smooth fashion.

present participle of rock along

(music) A subgenre of heavy metal which combines it with elements of psychedelic rock and acid rock.

plural of rock face

Alternative form of rock and roll

(music) A subgenre of experimental, intellectual rock music, often presented as a suite of pieces with a story or theme.

A radio programming format that includes hard rock music from the mid-1960s through 1980 or later.