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sea level

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absolute relief

absolute relief  

The maximum elevation of a particular area above sea level. Contrast relative relief.
Alliance of Small Island States

Alliance of Small Island States  

(AOSIS)A coalition of small, low‐lying island countries formed during the Second World Climate Conference in 1990 that includes 35 states from the Atlantic, Caribbean, Indian Ocean, Mediterranean, ...
altitude

altitude  

Reference type:
Overview Page
Height above sea level or ground level. Also known as elevation.
Antarctic Convergence

Antarctic Convergence  

A line of convergence in the ocean surrounding Antarctica between latitudes 50° S and 60° S, where cold surface water from Antarctica (Antarctic Surface Water) sinks below warmer, less saline water ...
Antarctic Ice Sheet

Antarctic Ice Sheet  

The Antarctic ice sheet is the world's largest ice mass, with an area of 13.83 million square kilometers; it constitutes 90 percent of the total volume of ice and 70 ...
anthropogeomorphology

anthropogeomorphology  

The study of those land-forms and processes that are a direct result of human activity, including accelerated erosion, channelized river channels (i.e. rivers made to flow along fixed, sometimes ...
atoll

atoll  

Ring-shaped organic reef that encloses or almost encloses a lagoon, and which is surrounded by the open sea. The reef may be built of coral and/or calcareous algae. An atoll is built on an existing ...
base level

base level  

A theoretical plane surface underlying a land mass, denoting the depth below which erosion would be unable to occur. Sea level provides a base level on a regional scale. Local base levels may be ...
biosphere

biosphere  

The whole of the region of the earth's surface, the sea, and the air that is inhabited by living organisms.
climate change

climate change  

Reference type:
Overview Page
Subject:
History
The change in world climate patterns over time. Such change has always occurred, both on a large scale since the formation of the earth and on a smaller scale within the span of human history. For ...
Climate Impacts

Climate Impacts  

The accumulation of greenhouse gases in the atmosphere due to fossil fuel combustion, land use change, and other anthropogenic activities may have begun to change the global climate system (Houghton ...
coastal Navigation

coastal Navigation  

Reference type:
Overview Page
Subject:
History
The difference between coastal navigation and pilotage is narrow, but a general definition of the former would be the safe conduct of a ship where the navigator has the land on one side of his course ...
Coastal Protection and Management

Coastal Protection and Management  

It has been claimed that 50 percent of the population in the industrialized world lives within 1 kilometer of the coast, and that roughly 75 percent of the world's population ...
coastlines

coastlines  

The line that separates land from sea. Also known as shoreline.
coral reef

coral reef  

An offshore ridge, mainly of calcium carbonate, formed by the secretions of small marine animals. Corals flourish in shallow waters over 21 °C and need abundant sunlight, so the water must be mud ...
cryosphere

cryosphere  

That part of the Earth where the surface is frozen, comprising the area covered by ice sheets and glaciers, permafrost regions, and sea areas covered by ice, at least in winter.
datum

datum  

Reference type:
Overview Page
Subject:
Law
A reference (such as mean sea level) against which to measure heights or depths.
eddy

eddy  

Reference type:
Overview Page
Motion of a fluid in directions differing from, and at some points contrary to, the direction of the larger-scale current. In air, eddies vary in size from small-scale turbulence (which can transport ...
environmental crisis

environmental crisis  

A term that is used to describe the sum of the environmental problems that we face today. Key contemporary environmental problems include the greenhouse effect and global warming, the hole in the ...
eustasy

eustasy  

The world-wide changing of sea level caused either by tectonic movements, or by the growth or decay of glaciers (glacio-eustasy, or glacio-eustastism).

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