HSC Geography: Ecosystems, Places, and Sustainability

A comprehensive set of vocabulary flashcards covering Ecosystems, Rural and Urban Places, Global Sustainability, and geographic skills based on the HSC Geography lecture notes.

Ecosystem Functioning

The processes and interactions within an ecosystem, such as energy cycling and biomass production, which are crucial for a healthy and productive environment.

Biotic Components

The living organisms within an ecosystem’s complex, dynamic system.

Abiotic Components

The physical or non-living environment within an ecosystem.

Eutrophication

The death of aquatic flora and fauna due to excessive algae growth in waterways, often caused by human activities disrupting natural nutrient cycles.

Trophic Levels

The hierarchical levels in a food chain where energy is transferred; only about $10\%$ of energy is moved to the next level, with the rest lost as heat.

Decomposers

Organisms like fungi and bacteria that release nutrients back into the ecosystem by breaking down organic matter.

Bioaccumulation

The build-up of non-biodegradable toxic substances, such as pesticides, which increase in concentration at higher levels of the food chain.

Nitrogen Fixation

The process necessary to convert gaseous nitrogen into a form that can be used by living organisms.

Dynamic Equilibrium

A state of balance in a system where changes occur but overall stability is maintained over time; it is a balance between vulnerability and resilience.

Autotrophs

Self-feeding organisms, mostly green plants, that take solar energy, water, $CO_2$, and nutrients to create organic compounds.

Biomass

An estimate of the amount of energy stored as living matter present in an ecosystem.

Vulnerability

The degree to which an ecosystem is susceptible to harm from external stressors such as climate change or human activity.

Resilience

The ability of an ecosystem to recover from disturbances while maintaining its functions and structures.

Anthropocentric

A management approach that focuses on human benefits, such as resources and the economy.

Ecocentric

A management approach that prioritizes the environment, seeing nature as valuable beyond human use.

Ecological Integrity

The ability of an ecosystem to function through interactions between the four spheres; higher integrity generally leads to more resilience.

Biocapacity

An ecosystem’s ability to regenerate resources and absorb pollutants.

Ecological Overshoot Day

The date when human consumption and pollution exceed the Earth's ability to regenerate resources in a year.

Shifting Baselines

A condition where individuals gradually accept environmental decline as normal because they create a new baseline, obscuring the full extent of historical loss.

Intra-generational Equity

The principle of equal resource access for all people living today.

Intergenerational Equity

The principle of preserving resources and environmental quality for the benefit of future generations.

Precautionary Principle

Acting to prevent environmental damage even if scientific certainty is lacking regarding the potential harm.

Zooxanthellae

Algae that form mutualistic relationships with coral polyps, providing up to $90\%$ of the coral's energy through photosynthesis.

Endemism

An ecological state where a species is unique to a defined geographic location and is found nowhere else.

Site

The physical characteristics of a settlement’s location, such as flat land, fertile soil, or water access.

Situation

A settlement’s location relative to other places, such as proximity to trade routes or other cities.

Urbanisation

The proportion of a country’s population living in towns and cities.

Urban Growth

The rate of increase in the population of urban areas over time.

Megacity

A city with a total population exceeding $10$ million people.

World Cities

Command and control centres for the world that possess cultural and economic authority and control the flow of information and finance.

Hinterland

The area representing the economic influences of a settlement, involving the import and export of goods and services.

Sustainable Development

An integrated approach to human development that balances social equity, cultural protection, economic growth, and responsible resource use to meet present needs without compromising future generations.

Benefit Sharing

Formal and mutually agreed terms for the equitable distribution of benefits arising from the commercial use of Indigenous knowledge, practices, or resources.

Ecotourism

Nature-based tourism that promotes environmental conservation and education while providing economic benefits to local communities.

Aspect

In geography skills, identifies the direction a slope faces.

Bearing

The measurement of direction from one point to another using degrees measured clockwise from north.

Isobars

Lines on a synoptic chart that connect points of equal atmospheric pressure.

Gradient

The steepness of a slope, calculated using the formula $\text{vertical rise} / \text{horizontal distance}$.