Base your answers to questions 11 and 12 on the cross section below. The cross section represents a part of Texas where weakly cemented sandstone is exposed at the surface. The mineral cement holding the sandstone grains together is calcite. Area X is a circular depression of loose sandstone that has been partially removed by prevailing winds. Sand dunes have developed downwind from depression X.80. On the diagram of the area of sand dune development provided below, draw a sketch showing the general sideview of a sand dune formed by a wind blowing in the direction indicated. Your sketch should clearly show any variations in the slope of the sides of the dune. [1]81.The cross section below shows this same area of Texas near the end of the last ice age when this area had a much wetter climate. More infiltration of rainwater was occurring at area X. Scientists infer that depression X was an area where slightly acidic rainwater collected and infiltrated into the sandstone. Figure:sand dunes are shown in the figure