Glossary of common Geography terms
I lay no claim to any of these images.
AA
An irregular block-like of solidified lava-flow.
It was form as a result of gases escaping violently from within the lava and the dragging of the lava against the ground.
It was form as a result of gases escaping violently from within the lava and the dragging of the lava against the ground.
Abrasion
The mechanical wearing-down of rocks by running water, moving ice, wind and waves.
Absolute Humidity
The mass of water vapour presented in a unit volume of moist air.
Warm air hold more water vapour than cold air.
Warm air hold more water vapour than cold air.
Acid Lava
A mass of molten rock that is high in silica, viscous and doesn't flow far.
This type of lava has a high melting point, it solidified rapidly and forms steep sided volcanic dome.
This type of lava has a high melting point, it solidified rapidly and forms steep sided volcanic dome.
Afforestation
The planting of trees where none grew previously or recently.
http://en.wikipedia.org/wiki/Afforestation
http://en.wikipedia.org/wiki/Afforestation
A-Horizon
The top zone of the soil profile immediately below the surface.
It is normally dark in colour due to the amount of humus content.
http://www.enchantedlearning.com/geology/soil/
It is normally dark in colour due to the amount of humus content.
http://www.enchantedlearning.com/geology/soil/
Alluvium/Alluvial soil
Alluvial fan
Altitude
Altocumulus
A fleecy cloud consisting of large whitish globular masses separated by blue shy.
Fair weather clouds. A corona appear around the sun or moon when they are seen through these clouds.
http://ww2010.atmos.uiuc.edu/%28Gh%29/guides/mtr/cld/cldtyp/mdl/altcu.rxml
Fair weather clouds. A corona appear around the sun or moon when they are seen through these clouds.
http://ww2010.atmos.uiuc.edu/%28Gh%29/guides/mtr/cld/cldtyp/mdl/altcu.rxml
Altostratus
A fairly uniform sheet-like layer of grey dark cloud.
It indicate the approach of rain.
http://www.clouds-online.com/cloud_atlas/altostratus/altostratus.htm
It indicate the approach of rain.
http://www.clouds-online.com/cloud_atlas/altostratus/altostratus.htm
Anemometer
Aneroid Barometer
An instrument that is used for measuring atmospheric pressure.
http://www.bom.gov.au/info/aneroid/aneroid.shtml
http://www.bom.gov.au/info/aneroid/aneroid.shtml
Anticline
Anticlone (high pressure area)
An anti-cyclone -- also known as a high pressure area -- is a large atmospheric circulation system with the wind flowing clockwise around it in the Northern Hemisphere, and counter-clockwise in the Southern Hemisphere.
http://www.weatheronline.co.uk/reports/wxfacts/Anticyclone.htm
http://www.weatheronline.co.uk/reports/wxfacts/Anticyclone.htm
Aphelion
Aquifer
A layer/stratum of permeable rock which can hold water. Underneath is a layer of impermeable rock..
http://en.wikipedia.org/wiki/Aquifer
http://en.wikipedia.org/wiki/Aquifer
Arable land
Artesian Basin
A basin/sink in the earth's with one or more aquifers which lies between layers of impermeable rock.
Ash (volcanic)
Volcanic ash consists of rock, mineral, and volcanic glass fragments smaller than 2 mm (0.1 inch) in diameter, which is slightly larger than the size of a pinhead.
http://volcanoes.usgs.gov/about/pglossary/ash.php
http://volcanoes.usgs.gov/about/pglossary/ash.php
Ash Cone
A small concave-shaped volcanic cone consisting of ash.
http://www.britannica.com/EBchecked/topic/118008/cinder-cone
http://www.britannica.com/EBchecked/topic/118008/cinder-cone
Atmosphere
The layer of tasteless, ordourless and colourless gas that surrounds the earth.
http://www.theozonehole.com/atmosphere.htm
http://www.theozonehole.com/atmosphere.htm
Atmospheric Pressure
the weight of the air on the surface of the earth.
http://cikguwong.blogspot.com/2011/06/physics-form-5-chapter-3-atmospheric.html
http://cikguwong.blogspot.com/2011/06/physics-form-5-chapter-3-atmospheric.html
Atoll
Atolls are circular, oval, or horseshoe-shaped arrays of coral reef islands that are perched around an oceanic volcanic seamount and encircle a shallow central lagoon.
http://www.eoearth.org/article/Atoll
http://www.eoearth.org/article/Atoll
Attrition
The wearing down and rounding of rocks as they are transported by running water and waves.
http://geobytesgcse.blogspot.com/2007/08/coastal-processes-erosion-transport-and.html
http://geobytesgcse.blogspot.com/2007/08/coastal-processes-erosion-transport-and.html