Which mountain range is growing by 6 centimetres a year How fast can lava flow across the land What is the world's biggest lake Find the answers to these questions and many more as you take a closer look at Earth's Landforms - by numbers From the depths of the oceans and underground caves to the top of the highest mountains and unpredictable volcanoes Earth's amazing landforms reveal fascinating facts about our planet. Discover how these landforms are constantly changing as new ones form and old ones disappear