Chapter 1: The Earth System Flashcards
Define ‘Earth system sciences’.
The science that studies the whole Earth as a system of many interacting parts and focuses on the changes within and between these parts.
Define ‘Remote sensing’.
Continuous or repetitive collection of information about a target from a distance. Satellite remote sensing has been extremely beneficial in the field of Earth system sciences.
Define ‘Geographic information system (GIS)’.
Computer-based programs which allow massive amounts of spatially referenced data points to be stored along with their characteristics.
Define ‘System’.
Any portion of the universe that can be isolated from the rest of the universe for the purpose of observing and measuring changes.
Define ‘Model’.
A representation of something.
Define ‘Isolated system’.
A system in which the boundary prevents the system from exchanging either energy or matter with its surroundings.
Define ‘Open system’.
A system in which the boundary allows the exchange of both energy and matter with the surroundings.
Define ‘Closed system’.
A system in which the boundary allows the exchange of energy, but not matter, with the surroundings.
Define ‘Box model’.
A simple, convenient graphical representation of a system.
Define ‘Flux’.
The amount of energy flowing through a given area in a given time.
Define ‘Reservoir’.
A storage place; a place in the Earth system where material or energy resides for some period of time.
Define ‘Sink’.
A reservoir in which the inward flux of matter exceeds the outward flux. The opposite of a source.
Define ‘Source’.
A reservoir in which more of a substance is coming from the reservoir than is flowing into it. The opposite of a sink.
Define ‘Steady state’.
A state in which the flux of matter into a reservoir exactly balances the flux of mater out of the reservoir.
Define ‘Anthroposphere’.
That part of the natural system that has been modified by humans for human purposes, or as a result of human activities.
Define ‘Atmosphere’.
The mixture of gases, pre dominantly nitrogen, oxygen, carbon dioxide, and water vapor that surrounds the Earth.
Define ‘Cryosphere’.
The part of the Earth’s sur face that remains perennially frozen.
Define ‘Hydrosphere’.
The totality of the Earth’s water, including the oceans, lakes, streams, water underground, and all the snow and ice, including glaciers.
Define ‘Feedback’.
A system response that occurs when the output of the system also serves as an input and leads to changes in the state of the system.
Define ‘Cycle’.
The constant, repeated movement of matter or energy from one reservoir to another.
Define ‘Hydrologic cycle’.
The movement of water between the various reservoirs of the hydrosphere.
Define ‘Equilibrium’.
A system that is self-regulating is said to have the property of homeostasis, which implies a state of equilibrium, or balance. However, it is a dynamic equilibrium; that is, the system isn’t just static or unchanging. Instead, it is constantly responding to small changes and disturbances, in such a manner that it returns to a state of equilibrium.
Define ‘Biogeochemical cycle’.
A natural cycle describing the movements and interactions through the Earth’s spheres of the chemicals essential to life.
Define ‘Negative feedback’.
The influence of a product on the process that produces it, such that production decreases with the growth of the product.
