Why were the cities of Timbuktu and Djenné important to the Mali Empire? Both were sites of important government offices.
Both were military outposts that defended the Mali Empire.
Both had important mosques and were centers for Islamic learning.
Both had large gold and salt mines that made the Mali Empire wealthy.

Both had important mosques and were centers for Islamic learning

Explanation:

per the notes

map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.

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