Volcanic plug near Rhumsiki, Far North Province, Cameroon

A volcanic plug, also called a volcanic neck or lava neck, is a volcanic landform created when lava hardens within a vent on an active volcano. When forming, a plug can cause an extreme build-up of pressure if volatile-charged magma is trapped beneath it, and this can sometimes lead to an explosive eruption. If a plug is preserved, erosion may remove the surrounding rock while the erosion-resistant plug remains, producing a distinctive landform. Image File history File linksMetadata Download high-resolution version (1000x750, 622 KB) Rhumsiki Peak in Cameroons Extreme North Province. ... Image File history File linksMetadata Download high-resolution version (1000x750, 622 KB) Rhumsiki Peak in Cameroons Extreme North Province. ... Kapsiki Peak Rhumsiki, also spelt Rumsiki and Roumsiki, is a village in the Far North Province of Cameroon. ... The Far North Province, also known as the Extreme North Province (from French Province de lExtrême-Nord), is the northernmost constituent province of The Republic of Cameroon. ... For other uses, see Volcano (disambiguation). ... Look up lava, Aa, pahoehoe in Wiktionary, the free dictionary. ... A vent can refer to: Look up Vent in Wiktionary, the free dictionary. ... The use of water pressure - the Captain Cook Memorial Jet in Lake Burley Griffin in Canberra, Australia. ... Volatiles are that group of compounds with low boiling points (see volatile) that are associated with a planets or moons crust and/or atmosphere. ... Magma is molten rock located beneath the surface of the Earth (or any other terrestrial planet), and which often collects in a magma chamber. ... Severe soil erosion in a wheat field near Washington State University, USA. For erosion as an operation of Mathematical morphology, see Erosion (morphology) Erosion is displacement of solids (soil, mud, rock and other particles) by the agents of ocean currents, wind, water, or ice by downward or down-slope movement...

Examples of landforms created in this way in the United States include Morro Rock, California; Lizard Head, Colorado; and Shiprock, New Mexico. Devils Tower in Wyoming is also thought to be a volcanic plug by many geologists. The only example of a volcanic plug in the eastern USA is the highly eroded Stark's Knob basaltic structure located along the Hudson River near Saratoga Springs, New York.^{[citation needed]} Also, the little devils postpile located in Yosemite National Park. However, some geologists believe Stark's Knob is not a plug at all, but merely an outcrop of an ancient submarine lava flow. Morro Bay Docks with Morro Rock in the background. ... Official language(s) English Capital Sacramento Largest city Los Angeles Area  Ranked 3rd  - Total 158,302 sq mi (410,000 km²)  - Width 250 miles (400 km)  - Length 770 miles (1,240 km)  - % water 4. ... Lizard Head (often called Lizard Head Peak) is a mountain in Colorado, one of the 637 peaks above 13,000 feet in elevation in the state (see thirteeners). ... Official language(s) English Capital Denver Largest city Denver Area  Ranked 8th  - Total 104,185 sq mi (269,837 km²)  - Width 280 miles (451 km)  - Length 380 miles (612 km)  - % water 0. ... Shiprock Shiprock, or Shiprock Peak (Dine: Tsé Bit Aí, winged rock) is a rock formation rising nearly 1,800 feet (540 meters) above the high-desert plain on the Navajo reservation, near the northern New Mexico town of Shiprock. ... Capital Santa Fe Largest city Albuquerque Area  Ranked 5th  - Total 121,665 sq mi (315,194 km²)  - Width 342 miles (550 km)  - Length 370 miles (595 km)  - % water 0. ... Devils Tower National Monument Devils Tower is a geological feature located in eastern Wyoming that was established as the first United States National Monument in 1906. ... Official language(s) English Capital Cheyenne Largest city Cheyenne Area  Ranked 10th  - Total 97,818 sq mi (253,348 km²)  - Width 280 miles (450 km)  - Length 360 miles (580 km)  - % water 0. ... the are cool The Geologist by Carl Spitzweg A geologist is a contributor to the science of geology, studying the physical structure and processes of the Earth and planets of the solar system (see planetary geology). ... The Hudson River, called Muh-he-kun-ne-tuk in Mahican, is a river that runs through the eastern portion of New York State and, along its southern terminus, demarcates the border between the states of New York and New Jersey. ... Saratoga Springs is a city located in Saratoga County, New York. ... NY redirects here. ...

Subsequent glacial erosion can lead to exposure of the plug on one side, while a long slope of material remains on the lee side. Such landforms are called crag and tail. Examples include the Castle Rock in Edinburgh, Scotland. A glaciation (a created composite term meaning Glacial Period, referring to the Period or Era of, as well as the process of High Glacial Activity), often called an ice age, is a geological phenomenon in which massive ice sheets form in the Arctic and Antarctic and advance toward the equator. ... The Abbey Craig, a crag with tail near The University of Stirling. ... The castle dominates the Edinburgh skyline as seen here from Princes Street Gardens Edinburgh Castle is an ancient fortress which, from its position atop Castle Rock, dominates the sky-line of the city of Edinburgh, and is Scotlands most famous (and most visited) landmark. ... This article or section does not adequately cite its references or sources. ... Motto (Latin) No one provokes me with impunity Cha togar mfhearg gun dioladh (Scottish Gaelic)1 Wha daur meddle wi me?(Scots)1 Anthem (Multiple unofficial anthems) Scotlands location in Europe Capital Edinburgh Largest city Glasgow Official languages English, Gaelic, Scots Government Constitutional monarchy  -  Queen Queen Elizabeth II...