The Question and Answer section for The Tempest is a great resource to ask questions, find answers, and discuss the novel.
Prospero is a powerful magician and is able to control spirits on the island as well as the natural elements.
What act and scene are you referring to? I can't see anything that Ariel gives the entourage. Ariel makes sure they are dispersed around the island.
"Sour green ringlets" are a description of what were to known as fairy rings in old English folktales. These rings were actually the result of toadstools, and the damage they cause to grass..... tunring it sour. Folk tales taught these rings were...