frost action in a sentence

Examples

1. The pass was named after nearby Sylvan Lake ( derived from medieval Latin sylv
   
   nus, from Latin Silv
   
   nus, god of the woods, from silva, forest ), and was formed by frost action breaking the rocks.
2. 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.