- Weathering is a kind of erosion
- Sediment is formed by rocks weathering
- So, sediment is formed by weathering / erosion

- Weathering is a kind of geologic process
- Erosion is a kind of process
- Therefore, weathering and erosion are kinds of processes

- Weathering and erosion are kinds of processes
- If something is formed by a process then that something is formed as a result of that process
- So, if something is formed by weathering and erosion then that something is formed as a result of weathering and erosion

- Sediment is formed by weathering / erosion
- If something is formed by weathering and erosion then that something is formed as a result of weathering and erosion
- Therefore, sediment is formed as a result of weathering / erosion

So, sediment is formed as a result of weathering / erosion
Which of these is directly formed as a result of weathering and erosion?
- Weathering is a kind of erosion 
- If something is formed by a process then that something is formed as a result of that process 
- Sediment is formed by rocks weathering 
- Weathering is a kind of geologic process 
- Erosion is a kind of process