Leonardo da Vinci identified many monocular depth cues, including , in which a near object blocks an object that is farther away.

the aksumite empire was an ancient kingdom located in what is now northern ethiopia from the period of 100 ad to 940 ad. its capital was the city of aksum. the kingdom established itself as one of the 4 great powers at its time, along with persia, rome, and china.

the kingdom was rich in goods like gold, iron, and salt. it established strong commercial ties with the regions governed by rome, egypt, and persia (arabia). aksum was a key location in this commercial network. trade was also facilitated with the introduction of the aksumite currency.

answer; ///he could not explain why the continents drifted;

answer; they burn down the bushes and trees;

human impact on coral reefs is significant. coral reefs are dying around the world. damaging activities include coral mining, pollution