__ Mixer, Often Seen on a Building Site
Puzzle 4 of Deserts Medium Pack
Question is: __ Mixer, Often Seen on a Building Site
and the answer is: CEMENT
Word Meaning:
CEMENT — (countable, uncountable) A powdered substance produced by firing (calcining) calcium carbonate (limestone) and clay that develops strong cohesive properties when mixed with water. The main ingredient of concrete.
Definitions from Wiktionary.