question: A seismometer measures what aspect of an earthquake?
choices.text: friction shaking pitches waves Fractions visibility heating velocity
choices.label: A B C D E F G H
fact2: The magnitude of an earthquake is its strength, or the amount of shaking.
combinedfact: A seismometer is used to measure the amount of shaking of an earthquake 
formatted_question: A seismometer measures what aspect of an earthquake? (A) friction (B) shaking (C) pitches (D) waves (E) Fractions (F) visibility (G) heating (H) velocity