Depends on the erosion factors... If the factor is an acid rain then the limestone is the first one. If the factor are wind and water, then the sandstone is the first one. In any case scenario, the magma rocks are the last, it is difficult to erode
Water sources in the Middle East are limited and very polluted. These people do not have clean water, and the water they can get, they are very thankful for, although it is full of bacteria and mud.
