Grade Level: 4th Grade
In January of 1952, the Sierra Nevada mountains of California were stuck by a record-breaking blizzard. Railroad tracks through the mountain passes were being blocked by avalanches and snowdrifts. The tracks were generally kept clear by powerful rotary snowplows, but this blizzard was like nothing the Southern Pacific Railroad had ever seen before.
Martinez, Elizabeth, "Physical Science - RAILROAD RESCUE: Energy Conversion" (2019). Model NGSS Lessons: 4th - 5th Grade. 6.