Change my first, and I’m a hardened substance that may have ancient insects or plants in it. Add a letter instead, and I become a person that belongs to a group. Make sure you throw water on me when you’re done. Smokey says only you can prevent forest fires!

An endless flow, A boundless river, I crumble empires, I stumble kings, before my might, even the mightiest quiver

My symbol is a winged dove People pray for me with love Tolstoy's story paired me with my opposite To achieve me doesn't happen overnight.

I can't be touched, I can't be felt I can't be seen, or heard, or smelt. I lie behind and betwixt the stars, Or hide within the depths of jars, I'm found under the hills, and all the empty holes I eagerly fill, I come early, I follow after, I end life, I kill laughter.

A measuring cup, piano, and most fish have this in common.