subclass_of phreatomagmatic eruption
A ___MASK100___ chamber is a large underground pool of ___MASK6___ rock found beneath the ___MASK12___ of the Earth . The molten rock in such a chamber is under great pressure , and given enough ___MASK40___ , that pressure can gradually fracture the rock around it creating outlets for the ___MASK100___ . If it finds a way to the ___MASK12___ , then the result will be a ___MASK2___ ; consequently many volcanoes are situated over ___MASK100___ chambers . Magma chambers are hard to detect , and most of the known ones are therefore close to the ___MASK12___ of the Earth , commonly between 1 km and 10 km under the ___MASK12___ . In geological terms , this is extremely close to the ___MASK12___ , although in human terms , it is considerably deep underground . ___MASK100___ ( from ___MASK92___  (" mágma ") meaning " thick unguent ") is a mixture of molten or semi - molten rock , volatiles and solids that is found beneath the surface of the Earth , and is expected to exist on other terrestrial planets and some natural satellites . Besides molten rock , magma may also contain suspended crystals , dissolved ___MASK83___ and sometimes ___MASK83___ bubbles . ___MASK100___ often collects in magma chambers that may feed a volcano or solidify underground to form an intrusion . ___MASK100___ is capable of intruding into adjacent rocks ( forming igneous dikes and sills ), extrusion onto the surface as lava , and explosive ejection as tephra to form pyroclastic rock . ___MASK57___ is fragmental ___MASK49___ produced by a ___MASK2___ regardless of composition , fragment size or emplacement mechanism . Phreatomagmatic eruptions are defined as juvenile ___MASK87___ eruptions as a result of interaction between water and magma . They are different from magmatic and phreatic eruptions . The products of phreatomagmatic eruptions contain juvenile clasts , unlike phreatic eruptions , and are the result of interaction between magma and water , unlike magmatic eruptions . It is very common for a large explosive eruption to have magmatic and phreatomagmatic components . Earth , otherwise known as the ___MASK1___ , is the ___MASK15___ planet from the Sun and the only object in the Universe known to harbor life . It is the densest planet in the Solar ___MASK30___ and the largest of the four terrestrial planets . ___MASK92___ includes the forms of Greek used in ancient Greece and the ancient world from around the 9th century BC to the 6th century AD . It is often roughly divided into the Archaic period ( 9th to 6th centuries BC ), Classical period ( 5th and 4th centuries BC ), and Hellenistic period ( 3rd century BC to the 6th century AD ). It is antedated in the ___MASK23___ millennium BC by Mycenaean Greek . A ___MASK4___ satellite or moon is , in the most common usage , an astronomical body that orbits a planet or minor planet ( or sometimes another Small Solar System Body ). A ___MASK52___ is a rupture in the crust of a planetary - ___MASK97___ object , such as Earth , that allows hot lava , volcanic ash , and gases to escape from a magma chamber below the surface . Pyroclastic rocks or pyroclastics ( derived from the , meaning ___MASK27___ ; and , meaning broken ) are clastic rocks composed solely or primarily of volcanic materials . Where the volcanic material has been transported and reworked through mechanical action , such as by wind or water , these rocks are termed volcaniclastic . Commonly associated with unsieved volcanic activity  such as Plinian or krakatoan eruption styles , or phreatomagmatic eruptions  pyroclastic deposits are commonly formed from airborne ___MASK46___ , lapilli and bombs or blocks ejected from the volcano itself , mixed in with shattered country rock . ___MASK34___ is the molten ___MASK33___ expelled by a volcano during an eruption . The resulting ___MASK33___ after solidification and cooling is also called " lava ". The molten ___MASK33___ is formed in the interior of some planets , including Earth , and some of their satellites . The source of the heat that melts the ___MASK33___ within the earth is geothermal energy . When first erupted from a volcanic vent , lava is a ___MASK6___ usually at temperatures from .