Glacial erosion is like when a big, heavy monster made of ice moves across the Earth and scrapes away everything in its path. This monster, called a glacier, is very powerful and can push rocks, dirt, and other things out of the way as it moves. Imagine a giant bulldozer made of ice!
As the glacier moves, it drags along all sorts of things with it, like big rocks called boulders, and smaller rocks called gravel. These things get caught in the ice and are carried along like they're on a ride. As the glacier moves and melts, it leaves behind a bunch of debris in its path. This debris can create things like hills, valleys, and even lakes!
One of the cool things about glacial erosion is that it can create really cool rock formations. Sometimes, when the glacier moves over a hard rock, it can carve it into interesting shapes. This is how things like Yosemite National Park's Half Dome were formed! It's pretty amazing what a big, heavy monster made of ice can do.