Our Wonderful Planet Earth is a children's book told in rhyme, answering 18 questions that children might ask regarding our planet: What is the Earth like inside? What is magma? Where does natural gas come from? Why do the bottoms of pots on a gas stove sometimes get black? What is a desert? Why does a geyser throw out steam? Why is there sand on a beach? Why is the water in the ocean salty? Why is there always a breeze at the ocean? What holds an island up? How were caves formed? How can wind and rain carve rocks? What is a wind cave? What was the ice age? What is a glacier? What are ice caves? Why does a compass point north?