The article outlines ways that teachers could use the content in Biomes and Food Security unit in the Australian curriculum, and its state and territory versions, to encourage their students to engage with higher order thinking. It first briefly discusses how to describe and classify higher-order thinking and argues that concepts are central to this thinking. It also argues that powerful knowledge, an idea associated with Michael Young, develops the same ways of thinking. The article then discusses the higher order actions of explaining (in the sense of explaining causation), analysing, synthesising (or generalising) and evaluating, and how they can be applied to the content of the unit. The contribution of geography's major concepts (such as place and interconnection) to higher order thinking, and therefore to making the unit "geographical," is also discussed. The article concludes with a description of a way of teaching the unit as an extended inquiry, organised as a series of questions. This strategy provides many opportunities to use higher order thinking, because to answer the questions students will have to explain, analyse, synthesise, generalise and evaluate, while the whole unit becomes an exercise in problem solving.