Why is the Moon Hollow?

(600 words) “Bible stories, that’s all they are!” I said. “Mr Newby said the moon was created on the fourth day, along with the Sun!” Mr Newby being my seven-year-old son, Ivan’s Religious Education teacher. “Well, not everything in the Bible is completely true,” I said gently, laying a hand on his shoulder. “Some of it’s an ... interpretation.” “What’s intep..., inteperetation?” His big blue eyes looked up at me earnestly. I suddenly wondered what it meant myself. “Well, it’s a way of saying things in ... a different way,” I ventured.