Pretend you are Marco Polo or Zheng Qian. Write a brief paragraph that they could have written in one of their daily journals about their life on the Silk Road.

lincoln presided over the union victory in the american civil war, which dominated his presidency. a former whig, lincoln ran on a political platform opposed to the expansion of slavery in the territories. his election served as the immediate impetus for the outbreak of the american civil war.

sitting in that one chair where he could get shot at was his worst decision.

an early twentieth-century ad for model home blueprints

incident infrared radiation is blocked. visible and ultraviolet radiation heat   earth.

earth radiates infrared radiation. infrared radiation is blocked and heats earth. visible and shortwave radiation heat earth.

earth radiates longwave radiation

longwave radiation is reflected downward longwave radiation heats earth