Particles that form a sedimentary rock by accumulating are called sediment. Before being deposited, sediment was formed by weathering and erosion in a source area, and then transported to the place of deposition by water, wind, ice, mass movement or glaciers which are called agents of denudation.
A cuboid is a box-shaped solid object. It has six flat sides and all angles are right angles. And all of its faces are rectangles.
A trapezoid is defined as a four-sided polygon with one pair of parallel sides. A rectangle is a four-sided polygon with each side parallel to its opposite side (basically, two pairs of parallel sides) and four right angles, so all rectangles could technically be considered as trapezoids. Hope this helps.