1: What is beneath our feet? 2: Has Earth always looked like this? 3: Do all volcanoes look like ice cream cones? 4: What makes the ground shake? 5: What makes waves? 6: Why does a compass always point north? 7: How hot are lightning bolts? 8: How can a lake be rainbow-coloured? 9: Can you eat snow doughnuts? 10: Can air destroy a house? 11: Why do clouds come in different shapes? 12: Can it ACTUALLY rain cats and dogs? 13: Why is the sky blue? 14: How are mountains hot and cold at the same time? 15: How can a desert form next to an ocean? 16: Do mountains keep growing? 17: What is at the end of a rainbow? 18: Can hailstones get as big as footballs? 19: How to oceans freeze over? 20: Why are some rocks stripey? 21: Do rivers ever run out of water? 22: Glossary 23: Find out more! 24: Index.