The ____________ is used to start each volley.

serve

The term "volley" can refer to different activities or sports, so the specific answer will depend on the context. Could you please specify the activity or sport you are referring to?

To find the answer to this question, we need to look for information regarding something that is used to start each volley. In the context of your question, "volley" could refer to various activities or sports, such as volleyball, tennis, or firearms. Without more specific context, it is challenging to determine the exact answer.

If you are referring to the starting action in the game of volleyball, the term "serve" is used to begin each volley. The server stands behind the end line and hits the ball over the net to initiate the game.

However, it's important to note that different activities or sports may have different terms or actions to start a volley. If you need more specific information or have a context in mind, please provide additional details to help me provide a more accurate answer.