Answer:
A bridge
Explanation:
If people build a bridge that will effect the landform! making the ground different, shapes sizzes ect! yk :)
The crust is the part you walk on, and it's the surface of the earth.
I think that the answer is, "It is the guardian of two of Islam's most sacred sites". This is because Medina and Mecca are located there, and they've very important sites in the Islamic religion.
Field trips are for seeing what is happening and what happened with your own eyes.
Necceasary things for survival are water, food, and shelter.
The Indian Ocean separates them