Answer: fourth option: The molecules combine and eventually fall as precipitation.
In the cloud water is in the form of tiny, tiny drops. As the cloud gain more drops they will get in contact with each other, and due to the surface tension of water the drops will form bigger drops until the weight is too much and the drops fall as precipitation.
Answer:
When a buzzer is associated with some kind of circuit and one press the key then the completion of the circuit takes place. As a consequence, the current will begin to flow from the cell or the battery and moves towards the buzzer. Therefore, the sound is generated by the buzzer because of the flow of the electrical charge through it.
After going through the buzzer, the electric charges again moves towards the battery. Thus, the electric charges move in the complete circuit.