Final answer:
Landforms such as deltas and beaches are formed by the deposition of sediment like silt and sand transported by water. Load casts and turbidite sedimentary deposits are examples of geologic features created by such depositions. Sedimentary rocks such as sandstone and shale form through a similar process but over much longer timescales.
Step-by-step explanation:
Landforms such as deltas and beaches, are formed when waves carrying silt, sand, or other rock materials deposit their load. When this sediment settles, it can lead to the creation of various geological features.
For example, load casts occur when dense, sandy sediment is deposited on top of less dense, water-saturated sediment, such as silt or clay. The weight of the sand pushes into the softer layer beneath, forming bulb-like structures that are characteristic of this process.
Turbidite sedimentary deposits are found on the sea-bottom and are the result of massive slope failures, where currents carry grains sorted by density, laying them down in layers upon the sea floor.
Another common feature is a delta, which forms at the mouth of a river. Deltas are often triangular and appear when river waters slow down and split into numerous channels, depositing the sand and silt that has been transported downstream over time.
Furthermore, sedimentary rocks, such as sandstone and shale, are formed through the deposition and cementation of material like igneous rock fragments or shells from living organisms. This occurs over long periods, where the particles are compacted and solidified.