question: what melts sometimes to form boulders?
choices.text: snow, ice, and rock precipitation thermal expansion building blocks of organisms rapid changes occur 70-75 degrees Fahrenheit permeable walls holding nutrients
choices.label: A B C D E F G H
fact2: Glaciers are made of snow, ice and rock.
combinedfact: boulders are formed by snow, ice, and rock melting sometimes
formatted_question: what melts sometimes to form boulders? (A) snow, ice, and rock (B) precipitation (C) thermal expansion (D) building blocks of organisms (E) rapid changes occur (F) 70-75 degrees Fahrenheit (G) permeable walls (H) holding nutrients