Moraines are accumulations of dirt and rocks that have been pushed along by glaciers. As glaciers move, they scrape the ground and carry debris with them. When the glacier melts, this debris is left behind, forming a ridge or mound. Moraines can be found in various shapes and sizes, depending on the glacier's movement and the materials it carried. There are different types of moraines, including terminal moraines, which mark the furthest advance of a glacier, and lateral moraines, which form along the sides. These landforms provide important clues about past glacial activity and help scientists understand the history of our planet's climate.