Erosion vs. deposition Erosion removes and transports sediment; deposition lays it down. A productive gravel bar exists because deposition concentrated material after erosion upstream.
Erosion rate vs. one‑time event A single storm cut can expose material fast, but it doesn’t represent long‑term erosion rate. Note the event context (recent flood, landslide, road work) so you don’t expect the same exposure next trip.
Erosion features vs. human disturbance Cut banks and gullies can be natural, but they can also be created or modified by equipment. If access or legality matters, record whether the exposure appears natural or man‑made.
Erosion vs. weathering stability Erosion can undercut slopes and banks, increasing collapse risk. Don’t confuse “good exposure” with “safe exposure”—evaluate stability separately.