Active reading has many benefits. First and foremost, through previewing, reading, and reviewing, it gets you involved in the material. When you read to collect data and retain information, active reading skills act as a catalyst for critical thinking skills that must be applied in a systematic way.
I think its an Idiom. I don't see like or as. So no simile. I don't see he is something like a marshmallow. - No metaphor. I also don't see a non-human thing doing human things- the grass was dancing in the wind. My answer would be an idiom.
