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Carrizozo Malpaís and White Sands National Monument, USA

33.7N 105.9W

October 9th, 2012 Category: Deserts, Volcanoes

USA – October 8th, 2012

The elongated brown area in this image is the Carrizozo Malpais, a large lava flow on the west side of Carrizozo, New Mexico, on the northern part of the Tularosa Basin between Sierra Blanca to the southeast and the Oscura Mountains to the west.

The lava making up the flow came from Little Black Peak, about 10 miles north-northwest of Carrizozo, and went about 40 miles south-southwest down the bottom of Tularosa Basin in a series of recent (the last 1,000-1,500 years ago) active flows. At their southern end, the lava flows are about 12 miles north of the dune fields of White Sands National Monument.

The White Sands National Monument, easily spotted as a bright white area south of the lava flow, is located about 25 km (16 mi) southwest of Alamogordo in western Otero County and northeastern Doña Ana County in the state of New Mexico, at an elevation of 4235 feet (1291 m). The area is in the mountain-ringed Tularosa Basin and comprises the southern part of a 710-km² (275-mi²) field of white sand dunes composed of gypsum crystals.

Lava Fields and Flows Near Western Coastal Escarpment of Saudi Arabia

23.0N 41.2E

December 3rd, 2011 Category: Mountains, Volcanoes

Saudi Arabia - November 22nd, 2011

On the Red Sea coast of Saudi Arabia there is a narrow coastal plain, known as the Tihamah, parallel to which runs an imposing escarpment. The western coastal escarpment is composed of two mountain ranges, the Hijaz and the Asir, with a gap between them near the middle of the peninsula’s coastline.

Visible beyond this escarpment are several brown lava fields and dark brown lava flows. The Harrat Kishb, a 5,892 km2 lava field containing many volcanic cones, can be observed around two dark brown lava flows located close to each other.

Lava Fields and Agriculture on the Snake River Plain, Idaho, USA – October 23rd, 2009

42.9N 112.6W

October 23rd, 2009 Category: Image of the day, Rivers, Volcanoes

Idaho, USA - July 26th, 2009

Idaho, USA - July 26th, 2009

Both circular and rectangular fields follow the path of the Snake River on the Snake River Plain, in southern Idaho, USA. The large lake is the American Falls Reservoir, created by the dam of the same name.

The dam and reservoir are a part of the Minidoka Irrigation Project on the Snake River Plain and are used primarily for flood control, irrigation, and recreation.

The darker brown areas that differ from the otherwise tan terrain of the uncultivated parts of the plain are lava fields. The largest of these is Craters of the Moon National Monument and Preserve, which encompasses three major lava fields and about 400 square miles (1,036 km2) of sagebrush steppe grasslands to cover a total area of 1,117 square miles (2,893 km2).

All three lava fields of Carters of the Moon lie along the Great Rift of Idaho, with some of the best examples of open rift cracks in the world, including the deepest known on Earth at 800 feet (240 m). There are excellent examples of almost every variety of basaltic lava as well as tree molds (cavities left by lava-incinerated trees), lava tubes (a type of cave), and many other volcanic features

The second largest lava field on the Snake River Plain, in the upper right quadrant, is Hell’s Half Acre lava field. It is the youngest of the eastern basaltic lava fields of the plain, and covers an area of about 400 km2.

The lava is basaltic in nature which formed a broad, low shield volcano with dominantly pahoehoe flows that were erupted from a 3 km long, north-west to south-east trending vent system at the north-west part of the field during a brief eruptive episode about 5,200 years ago.

Mountains and Lava Fields in New Mexico, USA

35.0N 107.8W

July 28th, 2009 Category: Snapshots

New Mexico, USA - July 27th, 2009

New Mexico, USA - July 27th, 2009

The terrain of northwestern New Mexico, USA, is crossed by mountains and volcanic fields. Visible in the lower left quadrant of this orthorectified image is the Zuni-Bandera volcanic field.

Part of this volcanic field is the El Malpais National Monument. It is named El Malpais (meaning badlands in Spanish) due to the extremely rough, rugged lava flow that covers much of the park. The lava flows fill a large basin rimmed by higher sandstone that forms large, wind-carved bluffs around much of the badlands.

Several mountain summits can also be found in and near the lava fields. One of the tallest of these, appearing as a bright white cone southeast of the image center, is Cerro Alto, which climbs to 7,759 feet (2,364.94 meters) above sea level.

Jebel Marra Volcano, Sudan – January 12th, 2009

January 12th, 2009 Category: Image of the day, Volcanoes

Jebel Marra Volcano, Sudan - November 25th, 2008

Jebel Marra Volcano, Sudan - November 25th, 2008

Close-up of Jebel Marra Volcano, Sudan

Close-up of Jebel Marra Volcano, Sudan

This excellent view of Darfur, Sudan highlights the Jebel Marra Volcano and the Marra Mountains.

The Marra mountains rise steeply from the flat plains of western Sudan at about 1000 m elevation to just under 3000 m above sea level.

In the close-up image, we can see the volcano’s collapsed mouth, the Deriba Caldera, with two smaller calderas now acting as lakes. One of the lakes is quite deep, while the other is shallow and saline.

The Jebel Marra Volcano receives more annual rainfall than the rest of the surrounding desert, as it is one of the highest regions of the eastern Sahara Desert. Streams radiating out from the lakes of the caldera seem darker in color due to lava flow.

source Wikipedia