frost action वाक्य

The pass was named after nearby Sylvan Lake ( derived from medieval Latin sylvnus, from Latin Silvnus, god of the woods, from silva, forest ), and was formed by frost action breaking the rocks.
In cases where frost action has caused adjacent rails to rise higher, ballast tampers can raise rails above their original level to make the line level again . " Lining " rails doesn't involve ballast tamping, it merely ensures the rails are perfectly parallel and straight as possible.