What to say?

Last night after dropping her cousin off at home my daughter asks me "what do our souls look like?" I did a double take and asked "Huh?"  She asked again, mama "what do our souls look like?"  I felt like I had to be quick in my response, I didn't want to keep her hanging.  I said that our souls are round like the sun and are bright like the sun.  She accepted that.  Then she followed with, mama "why does God take our souls to Heaven?"  I again feeling like I needed to give her an answer said, "because God turns our souls into angels.  I explained we are humans here on earth and we are turned into
angels in Heaven to spend eternity with our loved ones who are also angels."  It was a pretty intense conversation for a 6 year old.  Who am I kidding, it was an intense conversation for a 38 year old.

Anyone else have had their kids ask them similar questions??  How do you answer them?