Volcanoes — Flashcards

Answer

A volcano is a vent or opening in the crust of the Earth, connected by a conduit to an underlying magma chamber from which molten lava, volcanic gases and steam are ejected. It is usually shaped like …

Answer

Volcanicity is the process that involves the intrusion of magma in the Earth’s crust or the extrusion of such molten material on the Earth’s surface. This process gives rise to volcanic eruptions.

Answer

Intrusive volcanic forms are created when lava solidifies within the Earth’s crust. Extrusive volcanic forms are created when lava comes out of the crust and solidifies on the surface. Intrusive forms…

Answer

A batholith is an intrusive volcanic form. It is a large, coarse-grained igneous landmass that forms the base of mountains after the upper rock layers are eroded away.

Answer

Laccoliths are intrusive volcanic forms. A large sill of acid lava solidifies slowly and gives it a dome shape.

Answer

Sills are intrusive volcanic forms formed when lava solidifies before coming out between horizontal layers of parent rocks.

Answer

Dykes or dikes are intrusive volcanic forms formed when magma solidifies in vertical columns, cracks, and faults of bed rocks.

Answer

Lopoliths are intrusive volcanic forms formed when lava solidifies in shallow basins in the shape of a saucer.