How is desertification affecting the sahel? a. it causes the land easier to farmb. it causes the land to become more aridc. it causes the formation of lakes and pondsd. it causes more people to move to the area.

The primary agent of contact metamorphism is

One of the main reasons societies settled along rivers in the neolithic era was because a) the village elders demanded it. b) the land there was more valuable. c) it was more safe and secure there. d) it provided irrigation for farming.

The covers all of earth like a thin shell,but it is not a solid sheet of material.it is broken up into several large sections and many smaller ones. fill in the blank.