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Earth Systems
$200The rigid outer part of the Earth, consisting of the crust and upper mantle.
$400The boundary where two tectonic plates move toward each other and collide.
$600This rock type forms from the cooling and solidification of molten magma or lava.
$800A massive, long-term variation in Earth's orbital parameters that affects climate.
$1000The process by which soil particles are moved from one location to another by wind or water.
Ecology
$200An organism that produces its own food through photosynthesis or chemosynthesis.
$400The total mass of living organisms in a given area at a specific time.
$600A species that has a disproportionately large effect on its environment relative to its abundance.
$800The movement of nitrogen through the biosphere, geosphere, and atmosphere.
$1000The series of predictable changes in the species composition of a community over time.
Population
$200The maximum population size of a species that an environment can sustain indefinitely.
$400A type of population growth where the rate of growth increases as the population increases.
$600The study of human population statistics such as birth and death rates.
$800The number of children a woman would have in her lifetime at current fertility rates.
$1000A model used to describe the shift from high birth and death rates to low birth and death rates.
Energy
$200Energy derived from sources that are naturally replenished on a human timescale.
$400The splitting of an atomic nucleus into smaller nuclei, releasing significant energy.
$600Organic matter used as a fuel, especially in a power station for the generation of electricity.
$800Energy generated by capturing the kinetic motion of water flowing through a turbine.
$1000The measure of energy efficiency in a building or appliance.
Pollution
$200Pollution that comes from a single, identifiable source like a pipe.
$400The accumulation of substances in an organism at higher concentrations than in the environment.
$600A persistent organic pollutant that was widely used as a pesticide before being banned.
$800The process of enrichment of water by nutrients, causing excessive plant growth.
$1000An agreement to reduce the production and consumption of ozone-depleting substances.
Global Change
$200A gas that contributes to the greenhouse effect by absorbing infrared radiation.
$400The rise in Earth's average surface temperature due to human activities.
$600The disappearance of all members of a species from the Earth.
$800The decline in the ocean's pH due to increased atmospheric carbon dioxide absorption.
$1000The warming of the central and eastern tropical Pacific Ocean.