When to plates collide causing heavy pressure to react with rocks and other minerals. This combination is mealted by the magma's heat then cools. It is very brittle and looks like a sponge. Other rocks similar to this are granite and sulfer...
http://wiki.answers.com/Q/How_is_balsalt_formed
|
|
|
Basalt is formed from lava which has erupted onto earth's surface .it will normally have small crystals that are hard to see .It can be a greenish black or a brownish black. It's a hard rock. Basalt is the most common volcanic rock.
|
www.robbins.ecasd.k12.wi.us/earthmaterials/how_is_basal...
www.robbins.ecasd.k12.wi.us/earthmaterials/how_is_basalt_formed.htm
|
|
|
Basalt - Wikipedia, the free encyclopedia
|
|
Basalt (pronounced /bəˈsɔːlt, ˈbeisɔːlt, ˈbæsɔːlt/ ) is a common extrusive volcanic rock. It is usually grey to black and fine-grained due to rapid cooling of lava at the surface of a planet. I...
en.wikipedia.org/wiki/Basalt
|
|
|
Basaltic magma is formed when parts of the mantle layer melt due to high temperatures deep within the Earth. The magma is at temperatures between 1100 to 1250° C when it reaches the Earth's surface as lava at a volcano or mid ocean ridge, yet it cools quickly, in a few days or a couple weeks, forming basalt.
|
www.windows.ucar.edu/tour/link=/earth/geology/ig_basalt...
www.windows.ucar.edu/tour/link=/earth/geology/ig_basalt.html&edu=high
|
|
|
|
Another common form is pillow lava which consists of pillows or balloon-like masses of basalt - usually with a very fine-grained or glassy outer layer. They are formed by the eruption of lava into water." (Hamilton et al 1976, 170)
|
www.hf.uio.no/iakh/forskning/sarc/iakh/lithic/basalt.ht...
www.hf.uio.no/iakh/forskning/sarc/iakh/lithic/basalt.html
|
|
|
Citation: Lytwyn, J., J. Casey, S. Gilbert, and T. Kusky (1997), Arc-like mid-ocean ridge basalt formed seaward of a trench-forearc system just prior to ridge subduction: An example from subaccreted ophiolites in southern Alaska, J. Geophys.
|
www.agu.org/pubs/crossref/1997/96JB03858.shtml
|
|
Geology Question: How Are Columnar Basalt Formed? The shape, formation and texture of a basalt is usually determined by the way it erupted and also where it erupted in terms of if it erupted in the sea ... How Is Basalt Formed?
|
www.blurtit.com/q146455.html
|
|
Basalt is a Igneous Rock, Igneous Rocks are formed by cooling lava (Magma), but only when the lava is Viscus (runny) because when lava cools, it turns into different type of rocks depending on the way it has cooled, basalt cooled slow becau...
http://www.blurtit.com/q4807561.html
|
|
Basalt is one of the major igneous rock types. ... Basalt is an extrusive or intrusive rock that makes up most of the world's oceanic crust. This specimen was erupted from Kilauea volcano in 1960. (more below)
|
geology.about.com/od/rocks/ig/igrockindex/rocpicbasalt....
geology.about.com/od/rocks/ig/igrockindex/rocpicbasalt.htm
|
|
