Stone boat

A stone boat is like a big sled or platform that farmers use to move heavy rocks or stones across their fields. It's really hard to move big rocks by yourself because they're really heavy and you might not be strong enough to lift them up. So, instead of lifting the rocks, you can put them on the stone boat and then pull or push it to move the rocks where you want them to go. Just like how you can put your toys on a wagon and take them from one place to another. Stone boats can be made out of wood and some people even make them out of old car parts. They've been used for a very long time by farmers and they're really helpful because they save a lot of time and effort.