View current agendas and minutes for all boards and commissions. Previous years' agendas and minutes can be found in the Archive Center.
Deposition is the process by which wind or water sediment settles out in layers. Furthermore, over time, the remains of living things may harden in this sediment and change into fossils. After sediment is deposited the processes of compaction and cementation change the fragments into sedimentary rock. Compaction. At first, the fragments of rock lie loosely together. But gradually, over many, many years these thick layers build up. This build up becomes heavy and presses down on the layers beneath it. Compaction is the pressing down of layers forcing the sediments to fit closer together. Over millions of years, this process can squeeze fragments tightly together. The layers often remain visible in the rock and may be used to identify sedimentary rock. Cementation
Elements from rocks, water, and the atmosphere combine to produce soluble minerals that crystallize in rock pores, along grain boundaries, and in fine fractures, ultimately causing disintegration. This process aids in the weathering of rocks in coastal regions where salt is provided by seaspray (fig.hemical weathering (decomposition). Processes of Chemical weathering. Chemical weathering breaks down minerals into different chemical components. Rocks, such as rock salt and limestone dissolve entirely, this is known as congruent solution.