antimeridian The line of longitude exactly 180 degrees east or west of the Prime Meridian, with which it forms a great circle dividing the Earth into the Eastern and Western Hemispheres. anticline A geological fold that has an arch-like convex shape and its oldest beds near its center, often visible at the Earth's surface in exposed rock strata.
anthropization The conversion of open spaces, landscapes, and natural environments by human action. Its latitude is approximately 66☃3′47.1″ south of the Equator. Antarctic Circle The southernmost of the Earth's two polar circles of latitude, south of which the sun appears above the horizon for 24 continuous hours at least once per year (and is therefore visible at midnight) and also appears at least partially below the horizon for 24 continuous hours at least once per year (and is therefore not visible at noon). Antarctic The region of the Earth that is south of the Antarctic Circle. altitude The height of an object in the atmosphere above sea level. alpine Characteristic of or resembling the European Alps, or any other high-elevation mountain range or mountainous environment (especially one deeply modified by glacial erosion so as to contain characteristic landforms such as cirques, horns, etc.), in topography, climate, or ecological communities. alluvium Clay, silt, gravel, or similar detrital material deposited by running water. These soils lack horizons and are usually highly fertile. alluvial soils Soils deposited through the action of moving water. Alluvial plains encompass the larger area over which a river's floodplain has shifted through geological time. alluvial plain A wide, flat, gently sloping plain created by the long-term deposition of alluvium from one or more rivers flowing from highland regions, and typically characterized by various fluvial landforms such as braided streams, terraces, and meanders.
They tend to be larger and more obvious in arid regions. Alluvial fans usually form at the base of mountains, where high-velocity rivers or streams meet a relatively flat area and lose the energy needed to carry large quantities of sediment, which ultimately spreads out in all available directions. alluvial fan A distinctly triangular or fan-shaped deposit of sediment transported by water, often referred to as alluvium. agricultural geography A sub-discipline of geography which studies the spatial relationships between humans and agriculture, as well as the cultural, political, and environmental processes that lead to parts of the Earth's surface being transformed into agricultural landscapes through primary sector activities. active volcano A volcano that is currently erupting, or one that has erupted within the last 10,000 years (the Holocene) or during recorded history. accessibility resource A naturally emergent landscape form that eases communication between areas. accessibility A locational characteristic that permits a place to be reached by the efforts of those at other places. A absolute location The particular location of a point on Earth's surface that can be expressed by a grid reference such as latitude and longitude.
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