What are central eruptions?

Central volcanoes are the simplest type of volcano. A long tube reaches up from the magma chamber deep below the surface. Here the rock is molten and under great pressure. Instead, it flows from the volcano's vent and is called lava. Together, ash and lava make the volcanic cone higher.

How does a crack break out?

FISSURE SYSTEMS AND RIFTING ZONES Regional fracture systems can occur where the earth's crust is broken and pulled apart by tensional forces. If these areas are underlain by reservoirs of basaltic magma, this low-viscosity melt will exploit the fractures and rise through the crust to generate a fissure eruption.

What erupts from volcanic fissures?

A fissure vent, also known as a volcanic fissure, eruption fissure, or simply a fissure, is a linear volcanic vent through which lava erupts, usually without any explosive activity. Fissure openings can cause large flood basalts, which flow first in lava channels and later in lava tubes.

What kind of eruption is a fissure in a volcano?

The eruption is part of a series of eruptions in the Bárðarbunga volcanic system. The radial fissure openings in Hawaiian volcanoes also produce "curtains of fire" as lava fountains erupt along part of a fissure. These openings build low ramparts of basalt spatter on both sides of the fissure.

Are there fissures in the Hawaii volcano?

In September 2014, a fissure eruption is underway at the site of the 18th century Holuhraun lava field. The eruption is part of a series of eruptions in the Bárðarbunga volcanic system. The radial fissure openings in Hawaiian volcanoes also produce "curtains of fire" as lava fountains erupt along part of a fissure.

Which is the best description of a split valve?

Crevice venting. A fissure vent, also known as a volcanic fissure, eruption fissure, or simply a fissure, is a linear volcanic vent through which lava erupts, usually without any explosive activity.

Volcanoes also do not always erupt vertically from a single crater near their summit. Some volcanoes exhibit flank and fissure eruptions. Notably, many Hawaiian eruptions start from rift zones, and some of the strongest Surtseyan eruptions develop along fracture zones.