Which of the following led directly to the formation of the mongol empire?

Explanation:

Mongol expansion into Central Asia began in 1209, as the Mongols pursued tribal leaders who opposed Chinggis Khan's rise to power in Mongolia and thus constituted a threat to his authority there. With their victories, the Mongols gained new territory.

the correct answer is:   the domino theory states that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.

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