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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.

The strong arm scoops up dirt and rocks. Then it swings around and drops them in a pile or a truck.

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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. Cement mixer trucks spin around to keep the wet concrete soft. Cement mixer trucks spin around to keep the wet concrete soft. The biggest dump trucks have tyres taller than a grown-up person. The biggest dump trucks have tyres taller than a grown-up person.