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Basic Concepts in Geography

25-NOV-2015 12:44

    Geography may be studied by way of several interrelated approaches, i.e., systematically, regionally, descriptively, and analytically.

    1. The Systematic approach organizes geographical knowledge into individual categories that are studied on a worldwide basis.

    2. The Regional approach integrates the results of the systematic method and studies the interrelationships of the different categories while focusing on a particular area of the earth.

    3. The Descriptive approach depicts where geographical features and populations are located.

    4. The Analytical approach seeks to find out why those features are located where they are.

    Concepts of Geography

    An Island

    Island

    Source: vignette1.wikia.nocookie.net

    It is any piece of sub-continental land that is surrounded by water. Very small islands such as emergent land features on atolls can be called islets, skerries, cays or keys. An island in a river or a lake island may be called an eyot or ait, or a holm. A grouping of geographically or geologically related islands is called an archipelago, e.g. the Philippines. A group of island is called ARCHIPELAGO. Indonesia is the largest Archipelago in the world.

    Peninsula

    Peninsula

    Source: wikimedia

    A body of land surrounded by water on three sides is called a peninsula. The word comes from the Latin paene insula, meaning “almost an island .The world’s largest peninsula is Arabia, covering about 1 million square miles (2.6 million square kilometres). It is bounded on the west by the Red Sea, on the south by the Gulf of Aden and the Arabian Sea, and on the east by the Persian Gulf and the Gulf of Oman.”

    Strait

    Strait

    Source: s3.amazon.com

    It is a naturally formed, narrow, typically navigable waterway that connects two larger bodies of water. It most commonly refers to a channel of water that lies between two land masses, but it may also refer to a navigable channel through a body of water that is otherwise not navigable, for example because it is too shallow, or because it contains an un-navigable reef or archipelago.

    Isthmus

    Isthamus

    Source: Wikimedia

    It is narrow strip of land connecting two large land areas otherwise separated by the sea. Unquestionably the two most famous are the Isthmus of Panama, connecting North and South America, and the Isthmus of Suez, connecting Africa and Asia.

    Gulf

    Gulf

    Source: wikimedia

    It is a portion of the ocean that penetrates land. Gulfs vary greatly in size, shape, and depth. They are generally larger and more deeply indented than bays. Like bays, they often make excellent harbours. Many important trading centres are located on gulfs. Creek<Gulf<Bay<Bight (all are same in nature but differ in size)

    Cape

    Cape

    Source: eoimages.gsfc.nasa.gov

    It is a high point of land that extends into a river, lake, or ocean. Some capes, such as the Cape of Good Hope in South Africa, are parts of large landmasses. Others, such as Cape Hatteras in the U.S. state of North Carolina, are parts of islands. Peninsulas are similar to capes. Most geographers consider capes to be smaller than peninsulas. Capes are narrow features that jut into a body of water. Peninsulas can be large, and many are barely connected to the mainland at all.

    Topography

    It is a field of geosciences and planetary science comprising the study of surface shape and features of the Earth and other observable astronomical objects including planets, moons, and asteroids. It is also the description of such surface shapes and features (especially their depiction in maps).

    Relief

    In geography, “relief” refers to the highest and lowest elevation points in an area. Mountains and ridges are typically the highest elevation points, while valleys and other low-lying areas are the lowest.

    Absolute location

    A point on the earth's surface expressed by a coordinate system such as latitude and longitude

    Aquifer

    An underground reservoir of water which can be extracted for surface use.

    Archipelago

    Archipelago

    A chain or set of islands grouped together

    Atoll

    Atoll

    A circular coral reef that encloses a shallow lagoon

    Biosphere

    The plant and animal life on the earth.

    Caldera

    A bowl-shaped circular depression caused by the destruction of the peak of a volcano. Crater Lake, Oregon is a caldera and not a crater.

    Cartogram

    A "map" that is a diagram used to present statistical information. A common cartogram shows the countries of the world with the size of the country representing its population.

    Cartography

    The art and science of making maps.

    Census

    An investigation or count of a population.

    Climate

    The long term trends in weather conditions for an area.

    Continental drift

    The current theory that the continents of the earth move across the earth on giant tectonic plates

    Continental shelf

    The extension of the continents into the ocean; continental shelf land would be exposed if sea level dropped.

    Demography

    The study of population statistics and trends, such as births, deaths, and disease

    Density

    The number of items per unit area, such as persons per square kilometre.

    Desert

    An area with little precipitation or where evaporation exceeds precipitation, and thus includes sparse vegetation.

    Ecology

    The study of the interrelationships between life forms and their environment.

    El Niño Southern Oscillation (ENSO)

    A periodic warming of the ocean waters in the eastern Pacific Ocean which affects global weather patterns.

    Epicentre

    The point on the earth's surface directly above the hypocenter, where the energy of an earthquake is first released.

    Equator

    Zero degrees latitude, divides the earth into the Northern and Southern hemispheres.

    Equinox

    The beginning of autumn and spring, the two days each year when the sun is directly overhead at the equator.

    Erosion

    Forces that shape the earth's surface. Includes water, wind, and ice.

    Estuary

    The wide end of a river when it meets the sea; salty tidal water mixes with the fresh water of the river here

    Fault

    A fracture in rock where there has been movement and displacement.

    Geologic time

    The calendar of the earth's history since its birth 4.6 billion years ago; geologic time is divided into eras, epochs, and periods.

    Geology

    Science of the earth's crust, strata, origin of rocks, etc.

    Glacier

    A large mass of ice thad moves over the land, carving and eroding surfaces as it moves

    Global Positioning System (GPS)

    A system of satellites and ground units which enable a user to determine their absolute location.

    Global warming

    The theory that temperature of the atmosphere an increasing due to the increase in gasses such as carbon dioxide.

    Globe

    A spherical model of the earth's surface that includes a map of the earth; also known as a terrestrial globe

    Greenhouse effect

    The analogy used to describe the ability of gasses in the atmosphere to absorb heat from the earth's surface

    Hemisphere

    Half of the earth's surface. There are four hemispheres, Northern and Southern (divided by the equator) and the Eastern and Western (divided by the Prime Meridian and 180°).

    Humidity

    The amount of water vapour in the air.

    Hurricane

    A tropical storm that contains winds of at least 74 miles per hour (119km/h). Also known as a cyclone in the northern Indian Ocean and a typhoon in the western Pacific Ocean.

    Hydrologic cycle

    The circulation of water between the atmosphere, streams and land, the ocean, and back to the atmosphere.

    Hydrosphere

    The water of the earth.

    International Date Line

    An imaginary line near 180° longitude that exists to separate the two simultaneous days that exist on the planet that the same time.

    Jet stream

    The high-altitude high-speed air current in the tropopause.

    La Niña

    A periodic cooling of the ocean waters in the Pacific Ocean which affects global weather patterns.

    Lagoon

    A small, shallow body of water between a barrier island or a coral reef and the mainland, also a small body of water surrounded by an atoll.

    Latitude

    Angular degrees based on the equator; the equator is 0° latitude and the North Pole is 90° North while the South Pole is 90° south.

    Lava

    Magma that reaches the earth's surface through a volcanic vent or fissure.

    Lingua franca

    The language used by a population as their common language.

    Lithosphere

    The soil and rock layer of the earth.

    Longitude

    Angular degrees based on the Prime Merdidian (0°) at Greenwich, London; degrees are east or west of Greenwich and meet in the Pacific Ocean at 180°.

    Magma

    Molten rock that lies beneath the surface of the earth; once exposed, magma becomes lava.

    Map

    A graphic representation of the earth's surface.

    Map projection

    A mathematical formula which assists in representing the curved surface of the earth onto the flat surface of a map.

    Map scale

    The relationship between distance on a map and the distance on the earth's surface.

    Megalopolis

    Several adjacent metropolitan areas with form a huge urban area. Conurbation.

    Meridian

    A line of longitude.

    Mesa

    A large flat-topped but steep-sided landform; they shrink to become buttes.

    Meteorology

    The scientific study of the atmosphere.

    Monsoon

    A wind system in Southeast Asia which changes direction seasonally, creating wet and dry seasons.

    Morphology

    The shape of a state or nation.

    Pangaea

    A huge landmass consisting of almost all the continental land on the earth which then divided and slowly became the continents we know today.

    Permafrost

    Permanently frozen water in soil.

    Physical geography

    The branch of geography dealing with the natural features of the earth.

    Plate tectonics

    The surface of the earth is composed of many large plates which slowly move around the planet, meeting and diverging, creating a variety of earthquakes, volcanoes, and mountains at their margins.

    Precipitation

    Any form of water that falls from the atmosphere to the surface of the earth (e.g. rain, snow, sleet, and hail).

    Primate city

    A city which is greater than two times the next largest city in a nation (or contains over one-third of a nation's population). Usually very expressive of the national culture and often the capital city.

    Prime meridian

    Zero degrees longitude. Also known as the Greenwich meridian because it was established at the Greenwich observatory near London.

    Region

    An area which is marked common characteristics

    Relative location

    A location of a place in relation to another place (i.e. south or downhill).

    Scale

    The relationship between distance on a map and on the earth's surface.

    Sustainable development

    Development that does not exploit resources more rapidly than the renewal of those resources.

    Topographic map

    A detailed, large scale contour map showing human and physical features.

    Weather

    The short term atmospheric conditions. See climate.

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