A. Name the 4 Wiggles, and their respective colors. Name 3 other main characters. Who is the newest Wiggle, and who did he replace?
Greg Page:Yellow, Jeff Fatt

urple, Murray Cook:Red, and Anthony Field:Blue. Dorothy the Dinosaur, Captain Feathersword, and Henry the Octopus. Greg Page left the group, and was replaced by Sam Moran.
B. The US Silver Dollar made its first appearance in what year? (regular issue). What non-American coin circulated before that and influenced the creation of the dollar?
The first US silver dollar, known as the Flowing Hair, first appeared as regular issue in 1794, even though they had been authorized by the Mint Act on April 2, 1792. The 8-reales coins of Spain were in circulation before that, and were the greatest influence in the creation of your silver dollar.
C. Name 3 different major classifications of meteorites.
Achondrites, Chondrites, Stony
D. I'm thinking of a non-USA volcanic island. Which one?
I'm hoping you're thinking of Krakatau, also known by some as Krakatoa, the most famous volcanic island (from an eruption/explosion/disappearing point of view), which would be the one I would think of, but I'm half Indonesian.
Thanks for the opportunity OE, that was fun looking some of these up!
Rik