What is the difference between a rocks glass and a tumbler?
No difference at all. Just the name. Same with "Cocktail Glass" also being known as a "Martini Glass".
The difference between breccias and conglomerate is that breccias are angular and conglomerates are smooth. What causes rocks to be smooth is transportation, such as when rocks are in a stream and are worn down. Therefore transportation is what causes the difference between breccias and conglomerates.
I will assume you do not know what a footed glass looks like. Think of it like this. You know what a wine glass looks like. It has a bowl, a stem and the base or foot. Take that glass and remove the stem and you have a footed glass. A tumbler has a flat bottom (no foot) and generally has straight sides. Tumblers are considered styles for drinking glasses (mixed drinks on the rocks…