The answer to this riddle is "silence." While silence cannot be seen, it can definitely be heard or felt through the absence of sound.
Radiation cannot be seen or smelled, as it is invisible and odorless. It also does not make any sound, so it cannot be heard.
A voice is an instrument that can be heard but cannot be seen or touched.
Music or sound is something that can be heard but not seen.
Some examples of nouns that cannot be seen are emotions (such as love or envy), concepts (such as justice or freedom), and abstract ideas (such as happiness or time). These nouns represent intangible or non-physical things that exist in our thoughts or beliefs.
One example of energy that cannot be seen, heard, or touched is electromagnetic radiation, such as gamma rays or radio waves. These types of energy are typically detected and measured using specialized equipment, but cannot be directly perceived by our human senses.
Radiation cannot be seen or smelled, as it is invisible and odorless. It also does not make any sound, so it cannot be heard.
The wind
A voice is an instrument that can be heard but cannot be seen or touched.
An echo. It is a sound that reflects off surfaces and travels back to the listener, but it cannot be seen.
Because empty space cannot propagate sound.
Thoughts or emotions are things that cannot be seen, heard, smelled, or felt in a tangible way. They are internal experiences that exist on a mental or emotional level.
An echo. It is a reflection of sound that can only be heard, and it repeats what is spoken to it.
The riddle likely refers to "thoughts" or "ideas." They can be conceptualized or understood (seen) but are intangible and cannot be physically observed (not seen). They can be expressed verbally or mentally (heard) but lack a physical sound on their own (not heard). Thoughts exist in the mind, giving them a sense of being alive, yet they don't have a physical form that can die.
Friendship is an abstract noun, a concept. It cannot be seen, heard, or touched.
because sound waves cannot travel through space
'Time'.
Kids are both to be seen and heard