The mass of bedrock forming the hill proved more resistant than the surrounding soil, forcing the bottom of the glacier up and over the hill, thus leaving the north side smooth and the south side steep and rugged where the glacier broke off chunks of rock as it passed.
(the glacier; broke off; chunks of rock; T:as it passed) (it; passed; ) (The mass of bedrock; forcing; the bottom of the glacier; up and over the hill) (The mass of bedrock; leaving; the north side; smooth and the south side steep and rugged)
the glacier it The mass of bedrock The mass of bedrock
broke off passed forcing leaving
chunks of rock T:as it passed
the bottom of the glacier up and over the hill
the north side smooth and the south side steep and rugged