Right now mountains are being moved! They're being moved very very slowly but it's still quite an exciting thought. Ice is incredibly powerful. Water can get into every tiny crack and crevice, so when it freezes and expands, it can split huge rocks into pieces and even slowly break down mountains.
Moving ice can change whole landscapes. During the Ice Age, when the climate was a lot colder than it is now, about a third of the planet, including the UK, was covered by a massive sheet of ice. Over thousands of years, these enormous rivers of ice (known as glaciers) moved very slowly across the landscape, dragging huge boulders and stones with them, carving out valleys and leaving behind piles of stones and rocks. You can sometimes see big, lonely boulders perched here and ther which would normally be found thousands of miles away! These are called erratics.
At the end of the Ice Age, as the climate warmed up and the ice began to melt, there was so much water around that sea levels started to rise, cutting off chunks of land and creating islands like Britain and Ireland. Some animals got left behind when this happened, and that's why you won't find any weasels, snakes or tawny owls in Ireland.