question: Warm air is able to fill more space than cold air because it is
choices.text: more dense less dense
choices.label: A B
para: Warm air is less dense than cool air, so it rises higher in the troposphere.
para_anno.effect_prop: density
para_anno.cause_dir_str: warm
para_anno.effect_dir_str: less
para_anno.cause_dir_sign: MORE
para_anno.effect_dir_sign: LESS
para_anno.cause_prop: temperature
question_anno.more_effect_dir: more
question_anno.less_effect_dir: less
question_anno.less_cause_prop: air
question_anno.more_effect_prop: dense
question_anno.less_effect_prop: dense
question_anno.less_cause_dir: dense