question: What do abrasive materials do?
choices.text: occurs over a wide range permeable walls rapid changes occur smooth wooden objects jeans destroyed crops decrease strength change an ecosystem
choices.label: A B C D E F G H
fact2: Dirt is an abrasive like sandpaper.
combinedfact: Abrasives are used to smooth wooden objects.
formatted_question: What do abrasive materials do? (A) occurs over a wide range (B) permeable walls (C) rapid changes occur (D) smooth wooden objects (E) jeans (F) destroyed crops (G) decrease strength (H) change an ecosystem