It's bascially a huge rock pile left behind by the movement of glaciers across the land.
(It; 's bascially; a huge rock pile left behind by the movement of glaciers across the land) (a huge rock pile; left; behind; by the movement of glaciers across the land)
It a huge rock pile
's bascially left
a huge rock pile left behind by the movement of glaciers across the land
behind by the movement of glaciers across the land