Final answer:
Coastlines and dunes differ in their formation; coastlines are shaped by oceanic processes while dunes are formed by the wind. However, both are influenced by wind, which can affect sediment patterns and lead to features like ripple marks and cross-bedding.
Step-by-step explanation:
One difference between coastlines and dunes is in their formation and composition. Coastlines are areas where land meets the ocean and are constantly affected by processes such as tides, waves, and the deposition of various sediments. On the other hand, dunes are formed by the action of wind that moves and deposits sand, creating mounds or ridges.
A similarity between coastlines and dunes is that both can be affected by the wind. In the case of coastlines, wind can contribute to the development of features such as dunes and affect sediment patterns. For dunes, wind is the primary force behind their creation and ongoing change. This dynamic process can also result in the creation of ripple marks and cross-bedding in the sediment structure.