Many have heard me, but nobody has seen me, and I will not speak back until spoken to. What am I?

Answer: echo

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Many people own a copy of me. Without me the world would fall. What am I?
Many shapes, many sizes. Can't be seen, only felt. I bring pain, I bring joy, I bring laughter, I bring happiness. I can tear the mightiest from their thrones, and those who have me are rich. What am I?
Men walk over me but boats go under me. What am I?
More rare today than long ago. There's a salutation from friends written below. What am I?
More valued than gold, more precious than silk. Pouring like wine and flowing like milk. A count’s nightly feast, an offering of war, a pact that is sealed forever more. What am I?
Most people love to use me. You make me glide through the air. Even your dog loves me. What am I?
My first can be found at the start of a letter. My second is the second of second. My third is the first letter. My fourth can be found by a fairway. My fifth is before the eye. My whole is a friend at the end. What am I?
My first half means container. Not a lot of people understand my language. What am I?
My first part compliments people. My second part makes things known. My third part hurts feelings. My fourth part holds a previous treasure. My fifth part is used when sharing fancy beverages. What am I?
My first part compliments people. My second part makes things known. My third part hurts feelings. My fourth part ma hold a previous treasure. My fifth part is used when sharing fancy beverages. What am I?
My first two letters say my name. My last letter asks a question. What I embrace I destroy. What am I?
My flavors ranges from strawberry to toe. What am I?