![]() A geographical location where there is little or no tide, i.e. amphidromic pointĪlso amphidrome and tidal node. The term is sometimes used interchangeably with elevation. 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 flowing 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. adret The sunny, warm aspect of a hill or mountain, as opposed to the ubac or shady side. 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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