How do weathering and erosion differ?

Weathering breaks down rocks; erosion moves them.
Weathering has to do with air; erosion has to do with rocks.
Weathering occurs only in winter; erosion occurs year-round.
Weathering can be chemical or physical; erosion is only chemical.
Which of these events moves small pieces of rocks away from where they originally formed?

Deposition
Weathering
Erosion
Oxidation