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Cement mixer trucks spin around to keep the wet concrete soft.

Cement mixer trucks spin around to keep the wet concrete soft.

The big drum turns slowly so the concrete does not go hard. When it arrives, the wet concrete is ready to pour.

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Excavators use a big metal arm and bucket to dig holes in the ground. Excavators use a big metal arm and bucket to dig holes in the ground. Dump trucks carry heavy loads of dirt and tip them out the back. Dump trucks carry heavy loads of dirt and tip them out the back. Bulldozers push piles of dirt with a big flat blade at the front. Bulldozers push piles of dirt with a big flat blade at the front. Cranes lift heavy things high up to help build tall buildings. Cranes lift heavy things high up to help build tall buildings. The biggest dump trucks have tyres taller than a grown-up person. The biggest dump trucks have tyres taller than a grown-up person.