It is the resistance to flow.
They are gaseous components of magma dissolved in the melt; readily vaporize (form a gas) at surface pressures.
These are buoyant plumes of hot ash-laden gas that can extend thousands of meters into the atmosphere.
It is a slow-moving type of lava that hardens to form rough chunks; cooler than pahoehoe.
It is hot, fast-moving type of lava that hardens to form smooth, ropelike coils.
It is a tunnel in hardened lava that acts as a horizontal conduit for lava flowing from a volcanic vent; allows fluid lavas to advance great distances.
It is lava having the surface of angular blocks associated with material having andesitic and rhyolitic compositions.
It is basaltic lava that solidifies in an underwater environment and develops a structure that resembles a pile of pillows.
It is volcanic rock ejected during an eruption; include ash, bombs, and blocks.
These are pebble like bits of magma that cool in the air.
It is a basalt that is highly vesicular.
It is a frothy volcanic ash.
It is pipelike opening through which magma moves toward Earth's surface; terminates at a surface opening called a vent.
It is a vertical conduit through which magmatic materials have passed.
It is the opening in earth's surface through which a volcanic eruption takes place.
It is a hill or mountain constructed by the extrusion of lava or rock fragments from a vent.
It is a vent in a volcanic area from which fumes or gases escape.
It is the depression at the summit of a volcano, or that which is produced by a meteorite impact.
It is a volcanic cone that forms on the flank or a larger volcano.
It is a broad, generally slopping cone constructed of solidified lava flows; this volcano profile is low & wide, basaltic lava, less dissolved gas, higher temperature, low viscosity.
Cinder cone (scoria cone)
It is a volcano constructed of loose rock fragments ejected from a central vent; this cone consists of basaltic lava, more dissolved gas, higher temperature, low viscosity.
Composite cones (stratovolcanoes)
It is a volcano composed of both lava flows and pyroclastic material; andesitic lava (intermediate); moderate silica content; more dissolved gas; lower temperature; moderate to high viscosity.
It is a roughly circular upfolded structure; magma type: pumice, heat, thick lava, obsidian, rhyolitic lava (high in Silica), more dissolved gas, lower temperature (600 degrees), high viscosity.
It is a turbulent mixture of pyroclastic and gases flowing down the flank of a volcano.
A mudflow composed of water and volcanic ash; triggered by the flash melting of the snow cap of a volcanic mountain or from heavy rain; very dangerous because they can occur suddenly and travel at great speeds.
It is a volcanic depression much larger than the original crater.
These are cracks in the rock along which there is a distinct separation.
A volcanic eruption emanating from an elongated fissure rather than a central vent.
These are flows of basaltic lava that issue from numerous cracks or fissures and commonly cover extensive areas to thicknesses of hundreds of meters.
It is a bulbous mass associated with an old-age volcano, produced when thick lava is slowly squeezed from the vent; may act as plugs to deflect subsequent gaseous eruptions.
It is an isolated, steep-sided, erosional remnant consisting of lava that once occupied the vent of a volcano.
Volcanic island arcs
These are a chain of volcanic islands generally located a few hundred kilometers from a trench where there is active subduction of one oceanic plate beneath another.
Continental Volcanic Arc
These mountains formed by igneous activity associated with the subduction of oceanic lithosphere beneath a continent.
This is igneous activity that occurs within a tectonic plate away from plate boundaries.
It is amass of hotter-than-normal mantle material that ascends toward the surface, where it may lead to igneous activity; of solid yet mobile material may originate as deep as the core-mantle boundary.
It is an area where magma from deep within the mantle melts through the crust above it.
This is the liquid layer 2270 kilometers (1410 miles) thick; it is the movement of metallic iron within this zone that generates Earth's magnetic field.
This is the solid layer & a sphere having a radius of 1216 kilometers (754 miles).
It is 500 Celcius degress that contains iron, sodium, silicon, & oxygen; ultramafic & super dense.
It is a tabular-shaped intrusive igneous feature that cuts through the surrounding rock.
It is a tabular structure that was intruded parallel to the layering of preexisting rock.
It is a pattern of cracks that form during cooling of molten rock to generate columns.
What happens with there is a substantial amount of silica?
With a higher percentage of silica, there is a greater amount of viscosity.
Ocean Ocean Divergent Boundary
This boundary runs around the USA.
This area is a convergent boundary and a subduction zone in South America.
This country is volcanic and has a convergent boundary.
Continent to continent
A collision will occur when combined.
What boundary is in Cascades, WA/ORE?
What boundary is in Southern California?
Transform boundary - San Andreas Fault
What boundary is in India and Asia?
Convergent - Himalayas.
What boundary is in East Africa?