question: Ivan yells across a canyon in the morning when it is cold and again later in the afternoon when it is hot. During which time did his voice travel the slowest?
choices.text: morning afternoon
choices.label: A B
para: For a given medium such as air, sound has a slower speed at lower temperatures.
para_anno.effect_prop: speed of sound
para_anno.cause_dir_str: lower
para_anno.effect_dir_str: slower
para_anno.cause_dir_sign: LESS
para_anno.effect_dir_sign: LESS
para_anno.cause_prop: temperature
question_anno.less_effect_dir: travel the slowest
question_anno.less_cause_prop: afternoon
question_anno.less_effect_prop: voice
question_anno.less_cause_dir: voice