question: An electromagnetic wave is traveling. Ned notices that the wave has stayed at its origin. As it travels, it is
choices.text: more diluted less diluted.
choices.label: A B
para: However, the energy is diluted as an electromagnetic wave travels farther from its source because it spreads out over an ever-larger area.
para_anno.effect_prop: dilution of energy
para_anno.cause_dir_str: farther
para_anno.effect_dir_str: diluted
para_anno.cause_dir_sign: MORE
para_anno.effect_dir_sign: MORE
para_anno.cause_prop: distance
question_anno.more_effect_dir: more
question_anno.less_effect_dir: less
question_anno.less_cause_prop: electromagnetic wave
question_anno.more_effect_prop: diluted
question_anno.less_effect_prop: diluted
question_anno.less_cause_dir: diluted