During her speech, silvia sees audience members nodding in agreement when she starts talking about why she believes it is important to take care of the environment. which part of the communication process is silvia experiencing when she observes her audience members nodding?

Feedback  

Explanation:

Feedback is a process whereby some proportion, function of the output signal of a system is passed to the input called feedback. usually, feedback is given intentionally. feedback is so important aspect to improve the task capability of a person. It controls the dynamic behavior of the person. Feedback is observed in many areas such as psychology.  

Feedback can be many types such as:

giant impact theory - the moon was formed from the collision between earth and another mars-sized body.

colliding planetesimals hypothesis - the moon was formed from the same cloud of material as earth.

capture hypothesis - the moon was locked into orbit by earths gravity as it was passing by it.

accretion hypothesis - the moon was formed from collisions and combining of planetesimals.

i think this is right, if not and you know better let me know.