scaffold: temporary structure used to support a work crew and materials

construction: process of the building or assembling of a building or infrastructure

foundation: lowest and supporting layer of a structure

Amazon rainforest: large rainforest in South America

group of humans: any set of human beings

crane: type of machine specialised in lifting objects

public works: broad category of infrastructure projects, financed and constructed by the government

river: larger natural watercourse

Porto Velho: the capital of the Brazilian state of Rondônia, in the upper Amazon River basin

wharf: structure on the shore of a harbor or on the bank of a river or canal where ships dock

Madeira River: river in Bolivia and Brazil

worker: person who works

railway: interconnected network of infrastructure and vehicles used for train rail transport