Chapter 14 studies a contemporary hazard up close — bushfires, the hazard that most defines the Australian landscape. The Black Summer of 2019–20 burned more than 24 million hectares, destroyed over 3,000 homes and killed or displaced nearly 3 billion animals — a scale that makes this topic urgent. This first lesson builds the foundations: what a bushfire is, the ingredients it needs, how it behaves, and how climate and terrain drive it. The science draws on bodies like CSIRO.
By the end you can:
Australia is the most fire-prone continent: many species are fire-adapted and even need fire to regenerate, yet the same fires destroy whole towns. A hazard becomes a disaster only when it harms people — Black Saturday (2009) killed 173; Ash Wednesday (1983), 75. The Australian Academy of Science shows a warming, drying climate is lengthening the fire season at both ends.
Ignition starts a fire — lightning (natural) or people (accidental or deliberate) — but the big three decide how bad it gets: fuel, weather and topography. The fire triangle captures the chemistry: remove heat, fuel or oxygen and the fire dies — the principle behind every firefighting tactic.
Fire doesn't just creep along the ground. Wind rips burning bark and leaves — embers — kilometres ahead to light spot fires, so a blaze leaps roads and rivers. Crown fires race through the canopy, and radiant heat — not flame — is the leading killer, deadly well before a fire arrives. CSIRO bushfire research models exactly this spread.
Terrain steers fire: it roughly doubles speed for every 10° of upslope, because flames pre-heat the fuel above them — a steep gully can turn deadly in minutes. Climate sets the background risk: El Niño brings hotter, drier years and La Niña grows the fuel that later burns. The warming trend is lengthening fire seasons (Ch.13).
Eucalypts resprout from epicormic buds hidden under their bark, and many seeds need fire's heat or smoke to germinate — fire is stitched into these ecosystems over millions of years.
For tens of thousands of years — more than 60,000 — First Nations peoples have used cool, low-intensity cultural burning to care for Country, cutting fuel loads and catastrophic-fire risk while renewing growth. This is living Indigenous knowledge, increasingly partnered into contemporary fire management. Learn it from endorsed sources — AIATSIS, NITV, ABC Education and the Firesticks Alliance — always with attribution.
The same drivers — drought, extreme heat and wind — produce record fires worldwide, all sharpened by a warming climate. Australia's Black Summer (2019–20) burned over 24 million hectares; California's 2020 season torched more than 1.6 million hectares; and Greece's 2023 Evros fire became the largest wildfire recorded in the EU. Comparing places shows the hazard is global, but that management and vulnerability differ hugely from country to country.
Behind the News breaks down how bushfires start, spread and are fought — a clear, Australian-focused primer that pulls together the fire triangle, the big three and firefighting tactics from this lesson. Watch for the exact vocabulary you'll need in the exam.
▶▶ Watch: Bushfire Special - Behind the News — Behind the News (click → opens on YouTube)As you watch, note: (1) which of the big three get mentioned; (2) the terms ember, crown fire and radiant heat in context; (3) one natural and one human factor named.
Every fact in this lesson traces to a primary or authoritative source — a research body, an official record or an endorsed cultural organisation. Use them to check the data and to build a research task; naming a real source is what lifts a response into the top bands.