With Kids at this age what "Why" really mean is "That's interesting to me. Let's talk about that together. Tell me more, please?" When I've connected with children and begun to spin a tale to answer this question, they've sat enthralled. There was no need to mention because, or therefore, or cause, or effect. They don't need to know why, all they need is animated attention and me saying whatever came to mind about that subject. After a brief interchange, we were both happy.