Would the best formation of coastal erosion be a cliff or a sea arch/sea stack/sea stump? And also if you're asked for a landform of deposition and one of erosion, can you do a waterfall for erosion and a beach for deposition? It was asked in 2014
A cliff would be the best answer for coastal erosion. For coastal deposition, its best to go with something like a tombolo, but a beach would work too. A waterfall is a great form of erosion to talk about, but only if your asked about river erosion. For river deposition, talk about an oxbow lake or a meander.