Steam roller

A steam roller is a really big, heavy machine that is used to squish and flatten things like roads, sidewalks, and other surfaces. It gets its name because it used to be powered by steam, which is like hot, wet air that comes from boiling water.

The steam roller has a big round drum on the front that is heated with steam and is used to roll over and flatten the surface. It also has big wheels that help it move around and steer. The steam roller is controlled by a person who sits in a special seat on top of the machine.

When the steam roller runs over things, it can make them very flat and smooth. This is important for things like roads, so that cars and trucks can drive on them safely and comfortably.

Overall, a steam roller is a big, powerful machine that helps make our roads and other surfaces nice and flat by using steam power to roll over them.