extrusive - ορισμός. Τι είναι το extrusive
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Τι (ποιος) είναι extrusive - ορισμός

IGNEOUS ROCK FORMED WHEN MAGMA EMERGES ABOVE THE EARTH'S SURFACE BEFORE COOLING
Extrusive Rock; Extrusive (geology); Extrusive rocks; Extrusive
  • Le Maitre, R.W.}} (''ed.''); '''1989''': ''A classification of igneous rocks and glossary of terms'', Blackwell Science, Oxford.
  • A volcanic rock from Italy with a relatively large six-sided [[phenocryst]] (diameter about 1 mm) surrounded by a fine-grained [[groundmass]], as seen in [[thin section]] under a [[petrographic microscope]]

Extrusive         
·add. ·adj Forced out at the surface; as, extrusive rocks;
- contrasted with intrusive.
extrusive         
¦ adjective Geology relating to or denoting rock that has been extruded at the earth's surface as lava or other volcanic deposits.
Extrusive rock         
Extrusive rock refers to the mode of igneous volcanic rock formation in which hot magma from inside the Earth flows out (extrudes) onto the surface as lava or explodes violently into the atmosphere to fall back as pyroclastics or tuff. In contrast, intrusive rock refers to rocks formed by magma which cools below the surface.

Βικιπαίδεια

Extrusive rock

Extrusive rock refers to the mode of igneous volcanic rock formation in which hot magma from inside the Earth flows out (extrudes) onto the surface as lava or explodes violently into the atmosphere to fall back as pyroclastics or tuff. In contrast, intrusive rock refers to rocks formed by magma which cools below the surface.

The main effect of extrusion is that the magma can cool much more quickly in the open air or under seawater, and there is little time for the growth of crystals. Sometimes, a residual portion of the matrix fails to crystallize at all, instead becoming a natural glass or obsidian.

If the magma contains abundant volatile components which are released as free gas, then it may cool with large or small vesicles (bubble-shaped cavities) such as in pumice, scoria, or vesicular basalt. Other examples of extrusive rocks are rhyolite and andesite.