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This article is about the physical-geographic term. For places named "Valley" see Valley (disambiguation). A valley is a landform, which can range from a few square miles (square kilometers) to hundreds or even thousands of square miles in area. It is typically a low-lying area of land, surrounded by higher areas such as mountains or hills.

Genesis of valleys


Valleys are formed by numerous geographical processes. Glacial valleys, which are usually U- rather than V-shaped, were formed tens of thousands of years ago (most likely during the last Ice Age) by the massive erosive power of glaciers. Several glacial valleys can be found in the English Lake District and many can be found in Alpine countries. Rift valleys, such as the Great Rift Valley, are formed by the expansion of the Earth's crust due to tectonic activity beneath the Earth's surface. Valleys are, however, most commonly formed by fluvial activity (the action of running water, such as rivers), which erodes the landscape.

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HN: AS WE HEAD INTO THE MIDDAY HOUR...PATCHY AREAS OF RAIN AND DRIZZLE WILL PERSIST ACROSS THE LOWER RIO GRANDE VALLEY http://s4z.us/bl.htm
Harlingen_TX_wx (Harlingen Weather) Sat, 26 Dec 2009 17:54:02 -0000
HN: AS WE HEAD INTO THE MIDDAY HOUR...PATCHY AREAS OF RAIN AND DRIZZLE WILL PERSIST ACROSS THE LOWER RIO GRANDE VALLEY http://s4z.us/bl.htm
MN: AS WE HEAD INTO THE MIDDAY HOUR...PATCHY AREAS OF RAIN AND DRIZZLE WILL PERSIST ACROSS THE LOWER RIO GRANDE VALLEY http://s4z.us/dk.htm
Mission_WX (Mission Weather) Sat, 26 Dec 2009 17:20:05 -0000
MN: AS WE HEAD INTO THE MIDDAY HOUR...PATCHY AREAS OF RAIN AND DRIZZLE WILL PERSIST ACROSS THE LOWER RIO GRANDE VALLEY http://s4z.us/dk.htm
PR: AS WE HEAD INTO THE MIDDAY HOUR...PATCHY AREAS OF RAIN AND DRIZZLE WILL PERSIST ACROSS THE LOWER RIO GRANDE VALLEY http://s4z.us/dk.htm
Pharr_Weather (Pharr Weather) Sat, 26 Dec 2009 17:20:05 -0000
PR: AS WE HEAD INTO THE MIDDAY HOUR...PATCHY AREAS OF RAIN AND DRIZZLE WILL PERSIST ACROSS THE LOWER RIO GRANDE VALLEY http://s4z.us/dk.htm
HN: THROUGH LATE MORNING...PATCHY AREAS OF RAIN AND DRIZZLE WILL PERSIST ACROSS THE LOWER RIO GRANDE VALLEY AND ADJACEN http://s4z.us/bl.htm
Harlingen_TX_wx (Harlingen Weather) Sat, 26 Dec 2009 16:54:02 -0000
HN: THROUGH LATE MORNING...PATCHY AREAS OF RAIN AND DRIZZLE WILL PERSIST ACROSS THE LOWER RIO GRANDE VALLEY AND ADJACEN http://s4z.us/bl.htm
HN: AREAS OF LIGHT RAIN AND DRIZZLE WILL CONTINUE TO AFFECT THE LOWER RIO GRANDE VALLEY AND ADJACENT WATERS OF THE LAGU http://s4z.us/bl.htm
Harlingen_TX_wx (Harlingen Weather) Sat, 26 Dec 2009 15:54:02 -0000
HN: AREAS OF LIGHT RAIN AND DRIZZLE WILL CONTINUE TO AFFECT THE LOWER RIO GRANDE VALLEY AND ADJACENT WATERS OF THE LAGU http://s4z.us/bl.htm
MN: AREAS OF LIGHT RAIN AND DRIZZLE WILL CONTINUE TO AFFECT THE LOWER RIO GRANDE VALLEY AND ADJACENT WATERS OF THE LAGU http://s4z.us/dk.htm
Mission_WX (Mission Weather) Sat, 26 Dec 2009 15:20:03 -0000
MN: AREAS OF LIGHT RAIN AND DRIZZLE WILL CONTINUE TO AFFECT THE LOWER RIO GRANDE VALLEY AND ADJACENT WATERS OF THE LAGU http://s4z.us/dk.htm

 
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