Year 9 Geography Revision Notes: Biomes & Food Security

Comprehensive vocabulary flashcards covering Year 9 Geography topics on biomes, biophysical spheres, agriculture, food security, and the Great Barrier Reef case study.

Biome

A large natural area on Earth extending over long distances with similarities in climate and conditions, home to specific flora and fauna adapted to live there.

Aquaculture

The farming of aquatic animals and plants (such as fish, crustaceans, and molluscs) in controlled water environments.

Horticulture

The cultivation of plant crops, including fruits, vegetables, and ornamental plants.

Agriculture

The practice of cultivating soil, growing crops, and raising livestock for food, fibre, and other products.

Water Stress

A condition occurring when the demand for water exceeds the available supply during a certain period, or when poor quality restricts its use.

Water Scarcity

A condition occurring when renewable fresh water supplies drop below $1{,}000\,\text{m}^3$ per person per year.

Food Insecurity

A condition where people lack regular physical or economic access to sufficient, safe, and nutritious food to meet dietary needs.

Famine

The most extreme, life-threatening phase of food insecurity, characterized by widespread starvation and acute malnutrition.

Vertical Farming

The practice of growing crops in stacked vertical layers within a controlled indoor environment rather than traditional horizontal fields.

Forest Biomes

Highly biodiverse environments ranging from hot, wet tropical rainforests to temperate forests that act as massive carbon sinks and provide the source for over 700 modern medicines.

Desert Biomes

Biomes characterized by extremely low rainfall, locations near the tropics and temperate zones, and extreme diurnal temperatures with hot daytime and cold nights.

Grassland Biomes

Biomes dominated by grasses with small or widely spaced trees, marking the transition zone between forests and deserts, and supporting grazing wildlife and domestic livestock.

Tundra Biomes

Cold, treeless regions situated at high latitudes (polar zones) or high altitudes (mountains) featuring mosses, lichens, and small shrubs, threatened by global warming and permafrost melting.

Aquatic Biomes

Water-based biomes covering roughly $\frac{3}{4}$ of the Earth's surface, split into freshwater (lakes, rivers, creeks) and marine (saltwater oceans, coral reefs) environments.

Prevailing Winds

Winds that blow consistently from a single primary direction.

Windward Side

The side of a mountain facing moist prevailing winds where rising air cools and drops heavy rain, nourishing rich flora and fauna.

Leeward Side (Rainshadow)

The sheltered side of a mountain away from prevailing winds where dry air descends, creating arid zones where deserts frequently form.

Seagrass Meadows

Submerged flowering marine plants that form underwater meadows off sandy coastlines in tropical and temperate waters, anchoring sediment and clarifying ocean water.

Old Growth Forests

Multi-layered forests with trees of mixed ages and minimal human disturbance that support rare and endangered species and provide vital carbon storage.

Atmosphere

The blanket of gases (predominantly nitrogen and oxygen) surrounding the Earth.

Hydrosphere

All liquid, frozen, and gaseous water found on Earth, including oceans, glaciers, rain, and water vapour.

Lithosphere

Earth's solid outer crust, including rocks, landforms, and soils.

Biosphere

The global network of all living organisms across Earth.

Photosynthesis

An ecosystem process wherein plants (biosphere) absorb $CO_2$ from the atmosphere, extract water from the hydrosphere, and take nutrients from the lithosphere to produce oxygen and biomass.

Erosion

The wearing away and transport of surface rocks and soils by wind, water, or ice.

Weathering

The physical breaking of rock (such as ice wedging) or the chemical breakdown of minerals (such as acid rain dissolution).

Overfishing

Extracting fish species from marine environments faster than they can naturally reproduce, leading to commercial stock collapses.

By-catch

The accidental capture and unintended mortality of non-target marine life during commercial fishing operations.

Food Availability

The pillar of food security requiring a sufficient, consistent supply of quality food produced through local agriculture or international imports.

Food Access

The pillar of food security denoting an individual's or community's economic (financial) and physical ability to obtain available nutritious food.

Food Utilisation

The pillar of food security involving proper food preparation, clean water, sanitation, and nutritional knowledge so the body can effectively absorb nutrients.

Food Stability

The pillar of food security ensuring reliable access to adequate food at all times, without risk of loss caused by sudden shocks like droughts, war, or economic crises.

Enhanced Greenhouse Effect

Accelerated global warming caused by human activities (such as burning fossil fuels) that release greenhouse gases and trap excess heat in the atmosphere.

Drip Irrigation

A sustainable farming method delivering water directly to plant roots to minimize evaporation and conserve scarce freshwater supplies.

Genetically Modified (GM) Crops

Crop varieties developed through genetic modification to be drought-resistant, pest-resistant, and higher-yielding in harsh climatic conditions.

Precision Agriculture

A farming approach utilizing technologies like drones, soil sensors, and data systems to maximize crop yields while using less land, water, and fertilizer.

Coral Polyps

Tiny marine animals that build reef architectures by extracting calcium carbonate from seawater to form rigid limestone skeletons.

Zooxanthellae

Microscopic photosynthetic algae that live inside coral polyps in a symbiotic relationship, providing nutrients and vibrant colours to the coral while receiving shelter.

Coral Bleaching

A thermal stress response occurring when water temperatures exceed $30^\circ\text{C}$, causing corals to expel toxic-producing zooxanthellae, turn white, and face starvation.

Ocean Acidification

The process where excess atmospheric $CO_2$ dissolves into seawater, lowering ocean pH (from historical $8.2$ down to $8.1$) and depleting the carbonate ions needed for coral calcification.

Great Barrier Reef Marine Park Authority (GBRMPA)

The contemporary management agency responsible for protecting the Great Barrier Reef using zoning plans that specify permitted, restricted, and strictly prohibited activities.