activity

belt

business

cobblestone

concrete

construction

conveyor

crushed

crusher

dig

earth

engineering

equipment

extraction

factory

geology

gravel

ground

heap

heavy

industrial

industrialized

industry

large

loading

lorry

macadam

machine

machinery

manufacturing

material

metal

mine

mineral

pebble

quarry

quarrying

rock

sand

stack

steel

stone

technology

transportation

truck

working

worksite