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Stack (geology)

 
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Stack (geology)
 
 
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A stack is a geological
Geology

Geology is the science and study of the solid and liquid matter that constitute the Earth. The field of geology encompasses the study of the composition, structural geology, physical properties, dynamics, and History of the Earth of Earth materials, and the processes by which they are formed, moved, and changed....
 landform
Landform

In the earth sciences and geology sub-fields a landform or physical feature comprises a geomorphology unit, and is largely defined by its surface form and location in the landscape, as part of the terrain, and as such, is typically an element of topography....
 consisting of a steep and often vertical column or columns of rock in the sea near a coast.






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Flowerpot Island Big Flowerpot
Dorset, Stack (small)
A stack is a geological
Geology

Geology is the science and study of the solid and liquid matter that constitute the Earth. The field of geology encompasses the study of the composition, structural geology, physical properties, dynamics, and History of the Earth of Earth materials, and the processes by which they are formed, moved, and changed....
 landform
Landform

In the earth sciences and geology sub-fields a landform or physical feature comprises a geomorphology unit, and is largely defined by its surface form and location in the landscape, as part of the terrain, and as such, is typically an element of topography....
 consisting of a steep and often vertical column or columns of rock in the sea near a coast. Stacks are formed when part of a headland
Headlands and bays

Headlands and bays are two related features of the coastal environment....
 is eroded
Erosion

For morphological image processing operations, see Erosion 'For use of in dermatopathology, see Erosion Erosion is the removal of solids in the natural environment....
 by hydraulic action
Hydraulic action

Hydraulic action is a form of mechanical weathering caused by the force of moving water currents rushing into a crack in the rockface. The water compresses the air in the crack, pushing it right to the back....
, which is the force of the sea or water crashing against the rock. The force of the water weakens cracks in the headland, causing them to later collapse, forming free-standing stacks and even a small island
Island

An island or isle is any piece of land that is surrounded by water. Very small islands such as emergent land features on atolls are called islets....
.

Without the constant presence of water, stacks also form when a natural arch
Natural arch

A natural arch or natural bridge is a natural formation where a Rock arch forms, with a natural passageway through underneath. Most natural arches form as a narrow ridge, walled by cliffs, become narrower from erosion, with a softer rock stratum under the cliff-forming stratum gradually eroding out until the rock shelters thus forme...
 collapses under gravity, due to sub-aerial processes like wind erosion. A stack may collapse or be eroded, leaving a stump
Stump

Stump may refer to:*Tree stump, the rooted remains of a felled tree*Stump , one of three small wooden posts which the fielding team attempt to hit with the ball...
.

Stacks typically form in horizontally bedded sedimentary rocks particularly on limestone
Limestone

File:Limestone Formation In Waitomo.jpgLimestone is a sedimentary rock composed largely of the mineral calcite . The deposition of limestone strata is often a by-product and indicator of biological activity in the geology record....
 cliffs, because of the medium resistance to erosion
Erosion

For morphological image processing operations, see Erosion 'For use of in dermatopathology, see Erosion Erosion is the removal of solids in the natural environment....
. a more resistant layer may form a capstone
Capstone

A capstone or coping stone is one of the finishing or protective stones that form the top of an exterior masonry wall or building. The term is also used for the stones making up the covering structure of an archaeological tomb....
. Cliffs with weaker rock such as clay
Clay

Clay is a naturally occurring material composed primarily of fine-grained minerals, which show plasticity through a variable range of water content, and which can be hardened when dried and/or fired....
 tend to slump
Slump

Slump is a form of mass wasting event that occurs when loosely consolidated materials or rock layers move a short distance down a slope. The landmass and the surface it slumps upon is called a failure surface....
 and erode too quickly to form stacks, while harder rocks such as granite
Granite

Granite is a common and widely occurring type of Intrusion , felsic, igneous rock rock . Granite has a medium to coarse texture, occasionally with some individual crystals larger than the groundmass forming a rock known as Porphyry ....
 erode in different ways. The sea attacks small cracks and opens them. The cracks then gradually get larger and turn into a small cave. When the cave wears right through the headland, an arch forms. Further erosion causes the arch to collapse, leaving the pillar of hard rock standing away from the coast called a stack.

Stacks are often important sites for nesting seabirds.

Some stacks are famous for rock climbing
Rock Climbing

Rock climbing is a sport in which participants climb up or across natural Rock formations or man-made climbing wall with the goal of reaching the Summit of a formation or the endpoint of a pre-defined route....
.

Examples

  • Flowerpot Island
    Flowerpot Island

    Flowerpot Island is an island in Georgian Bay, and is a part of the Fathom Five National Marine Park of Ontario, Canada. The island spans 2.1 km from east to west, and 1.5 km from north to south, and has a total area of 2 km? ....
    , Lake Huron
    Lake Huron

    Lake Huron, bounded on the west by the U.S. state of Michigan, and on the east by the Provinces and territories of Canada of Ontario, Canada, is one of the five Great Lakes of North America....
    , Canada
    Canada

    Canada is a country occupying most of northern North America, extending from the Atlantic Ocean in the east to the Pacific Ocean in the west and northward into the Arctic Ocean....
    .
  • Three Sisters, Eatonville, Nova Scotia
    Eatonville, Nova Scotia

    Eatonville is a former lumber and shipbuilding village in Cumberland County, Nova Scotia. It includes a large tidal harbour at the mouth of the Eatonville River beside several dramatic Stack known as the "Three Sisters"....
    .
  • Goat Rock
    Goat Rock Beach

    Goat Rock Beach is a sand beach in northwestern Sonoma County, California, United States.This landform is a sub-unit of Sonoma Coast State Beach, owned and managed by the State of California....
    , California
    California

    California is a U.S. state on the West Coast of the United States of the United States, along the Pacific Ocean. It is bordered by Oregon to the north, Nevada to the east, Arizona to the southeast, and to the south the Mexico state of Baja California....
    , USA.
  • Sugar Loaf
    Sugar Loaf (Mackinac Island)

    Sugar Loaf is a 75-foot-high landlocked rock or stack in the interior of Mackinac Island in Lake Huron. Created by erosion during the period of postglacial Lake Algonquin, Sugar Loaf is the largest post-glacial erosion feature in the Straits of Mackinac....
    , Mackinac Island
    Mackinac Island

    Mackinac Island is an island covering in land area, belonging to the U.S. state of Michigan. It is located in Lake Huron, at the eastern end of the Straits of Mackinac, between the state's Upper Peninsula of Michigan and Lower Peninsula of Michigan....
    , Michigan
    Michigan

    Michigan is a Midwestern United States U.S. state of the United States of America. It was named after Lake Michigan, whose name is a French adaptation of the Anishinaabe language term mishigama, meaning "large water" or "large lake"....
    , USA.
  • Haystack Rock
    Haystack Rock

    File:Haystack rock 00022.jpgHaystack Rock is a 235-foot tall monolith on the Oregon coast in the northwestern United States, the third-tallest such structure in the world....
    , Cannon Beach, Oregon
    Oregon

    Oregon is a U.S. state in the Pacific Northwest region of the United States. The area was inhabited by many indigenous tribes before the arrival of traders, explorers and settlers....
    , USA.
  • Old Harry Rocks
    Old Harry Rocks

    Old Harrys Rocks are made from chalk, formed by cockels and are located directly east of Studland and to the north of Swanage in Dorset. Nearby and to the north are the larger towns of Poole and Bournemouth....
    , Dorset
    Dorset

    Dorset , is a Counties of England in South West England on the English Channel coast. The county town is Dorchester, Dorset, situated in the south of the county at ....
    , England
    England

    native_name =|conventional_long_name = England|common_name = England|image_flag = Flag of England.svg|image_coat = England COA.svg|symbol_type = Royal Coat of Arms...
    .
  • The Needles
    The Needles

    The Needles is a row of three distinctive stack of chalk that rise out of the sea off the western extremity of the Isle of Wight, England, close to Alum Bay....
    , Isle of Wight
    Isle of Wight

    The Isle of Wight is an England island and county, located 3-8 km from the south coast of the mainland, in the English Channel. It is situated south of the county of Hampshire and is separated from mainland Britain by the Solent....
    , England
    England

    native_name =|conventional_long_name = England|common_name = England|image_flag = Flag of England.svg|image_coat = England COA.svg|symbol_type = Royal Coat of Arms...
    .
  • Am Buachaille
    Am Buachaille

    Am Buachaille is a sea stack, or vertical rock formation, near Sandwood Bay in the Scotland county of Sutherland at . It was first climbed in 1968 by the mountaineering Tom Patey and Ian Clough ....
    , Sutherland
    Sutherland

    Sutherland is a registration county, Lieutenancy areas of Scotland and historic administrative Counties of Scotland of Scotland. It is now within the Highland Council areas of Scotland....
    , Scotland
    Scotland

    conventional_long_name = ScotlandAlba|common_name= Scotland|image_flag = Flag of Scotland.svg|flag_width = 130px...
    .
  • Old Man of Hoy
    Old Man of Hoy

    The Old Man of Hoy is a Stack of Old Red Sandstone perched on a plinth of igneous basalt, close to Rackwick Bay on the west coast of the island of Hoy, in the Orkney Islands, Scotland....
    , Orkney, Scotland
    Scotland

    conventional_long_name = ScotlandAlba|common_name= Scotland|image_flag = Flag of Scotland.svg|flag_width = 130px...
    .
  • The Twelve Apostles, Victoria
    The Twelve Apostles, Victoria

    The Twelve Apostles are a collection of limestone stack off the shore of the Port Campbell National Park, by the Great Ocean Road in Victoria , Australia....
     on the Great Ocean Road
    Great Ocean Road

    The Great Ocean Road is a 243 km stretch of road along the south-eastern coast of Australia between the Victoria n cities of Torquay, Victoria and Warrnambool, Victoria....
    , Victoria, Australia
  • Percé Rock
    Percé Rock

    Perc? Rock is an island and sheer rock formation in the Gulf of Saint Lawrence just off the tip of the Gasp? Peninsula in Quebec, Canada, near the village of Perc?, Quebec....
    , Percé Quebec
    Quebec

    Quebec , in French language, Qu?bec , is a Provinces and territories of Canada in the Central Canada and Eastern Canada regions of Canada....
    , Canada
    Canada

    Canada is a country occupying most of northern North America, extending from the Atlantic Ocean in the east to the Pacific Ocean in the west and northward into the Arctic Ocean....
  • Hopewell Rocks
    Hopewell Rocks

    The Hopewell Rocks, also called the Flowerpot Rocks, are rock formations caused by tidal erosion in The Rocks Provincial Park in New Brunswick....
    , Hopewell Cape
    Hopewell Cape

    Hopewell Cape is a Canada village and headland in Albert County, New Brunswick, New Brunswick at the northern end of Shepody Bay and the mouth of the Petitcodiac River....
     New Brunswick
    New Brunswick

    New Brunswick is one of Canada's three Maritime provinces and is the only Constitution of Canada bilingual province in the federation. The provincial capital is Fredericton....
    , Canada
    Canada

    Canada is a country occupying most of northern North America, extending from the Atlantic Ocean in the east to the Pacific Ocean in the west and northward into the Arctic Ocean....
  • , High Island
    High Island, Hong Kong

    High Island or Leung Shuen Wan was an island in the southeast of Sai Kung Peninsula, Hong Kong. The island was connected to the peninsula by dams to enclosed the Kwun Mun Channel to form High Island Reservoir....
    , Hong Kong
    Hong Kong

    Hong Kong , officially the Hong Kong Special Administrative Region, is a territory located in Southern China in East Asia, bordering the province of Guangdong to the north and facing the South China Sea to the east, west and south....
  • Étretat
    Étretat

    ?tretat is a commune in France in the Seine-Maritime d?partement in France of France....
    , Seine-Maritime
    Seine-Maritime

    Seine-Maritime is a France departments of France in Normandy. Before 1955 it was known as Seine-Inf?rieure....
    , France
    France

    France , officially the French Republic , is a country whose Metropolitan France is located in Western Europe and that also comprises various Overseas departments and territories of France....
  • Lange Anna on Heligoland
    Heligoland

    Heligoland is a small Germany archipelago in the North Sea.Formerly Denmark and British Empire possessions, the islands are located in the Heligoland Bight in the southeastern corner of the North Sea....
  • Stac an Armin
    Stac an Armin

    Stac an Armin , based on the proper Scottish Gaelic spelling , is a sea stack in the St Kilda, Scotland archipelago. It is 196 metres tall, qualifying it as a Marilyn ....
    , St Kilda, Scotland
    St Kilda, Scotland

    St Kilda is an isolated archipelago 64 kilometres west-northwest of North Uist in the North Atlantic Ocean. It contains the western-most islands of the Outer Hebrides of Scotland....
  • Stac Dhomnuill Chaim, Lewis, Scotland