question: When we get to the top of a mountain the air is
choices.text: more dense less dense
choices.label: A B
para: At higher elevations, there is less air to press on a given area.
para_anno.effect_prop: air pressure
para_anno.cause_dir_str: higher
para_anno.effect_dir_str: less
para_anno.cause_dir_sign: MORE
para_anno.effect_dir_sign: LESS
para_anno.cause_prop: elevation
question_anno.more_effect_dir: more dense
question_anno.less_effect_dir: less dense
question_anno.more_effect_prop: air
question_anno.less_effect_prop: air
question_anno.less_cause_dir: air