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The biggest dump trucks have tyres taller than a grown-up person.

The biggest dump trucks have tyres taller than a grown-up person.

Each giant tyre can be about 4 metres tall. These huge trucks carry loads as heavy as many elephants.

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