Answer:
Sound is a form of energy that travels in waves known as compression waves or waves that are compacted by pressure. Sound can travel in many mediums such as solids, gas, and water. Most importantly is the presence of molecules in our atmosphere for sound cannot be heard in the vacuum of space. So, when you tap your pencil on your desk, you are creating a vibration that can be heard. The harder you tap, the louder the sound will be.
Step-by-step explanation:
I hope it will be helpful for you.