How did the Egyptians use resin and how did they make it?

The resin was used by the Egyptians as part of the mummification process. The resin was poured into the person's skull after the brain was removed to help it keep its shape. It was also used to secure bandages in place.

Explanation:

the correct labels are as follows:

a: yellow river

b: himalayan mountains

c: north china plain

d: taklimakan desert

answer; i believe the correct answer is (crops);