INTRODUCTION TO VOLCANOES AND THEIR TYPES Flashcards
Study to relief features of the Earth’s crust
Geomorphology
Refers to vertical and Horizontal movement of the crust
Diastrophism
Physical removal of the rock or wearing down of landmasses by geomorphic agent
Erosion
Processes associated with the surface discharge of magma or hot water
Vulcanism
Ground water beneath the shallow surface is heated up until is explodes into boiling water and steam
Geysers
Emit mixture of steam and other gases such as hydrogen sulfide
Fumaroles
Occurs in many geothermal areas where the surface of the earth intersects the water table
Hot springs
Typically cone-shaped hill or mountain formed by the extrusion of lava or ejection of rock fragments from a vent
Volcano
A belt of volcanoes that rings the pacific ocean
Circle of Fire
Most striking part of the volcano, usually composed of mixtures of lava and pyroclastic
Cone
Opening through which an eruption takes place
Vent
Large underground pool of liquid rock found beneath the earth’s crust
Magma chamber
Basin-like depression over a vent at the summit of the cone
Crater
Volcanic depression much larger than the original crater
Caldera
Rock or magma expelled from a volcano during eruption
Lava
Barrier or obstacles in a volcano
Dikes
Solidified lava flows that originally forced their way between and parallel to older layers of rocks
Sills
Channel or pipe conveying liquid materials such as magma
Conduit
The side of the volcano
Flank
Highest point or apex of volcano
Summit
Entrance of the volcano
Throat
Expelled from the atmosphere
Ash cloud
Chunks of lava blasted into the air which solidify before reaching the ground
Volcanic Bombs
Fast moving currents of hot gases and rock travelling downhill from a volcano
Tephra Fall
Flowing mixture of volcanic debris and water
Lahar
Happens due to water and tectonic plates
Formation by subduction
Simplest type of volcano
Cinder cone
Made up of alternating layers of pyroclastic
Composite volcano
Built by many layers and has a wider vents
Shield vents
Aka: lava dome it is formed by small, bulging lavas
Volcanic domes
Produce largest eruptions on earth
Supervolcanoes
Erupts in the underwater fissures
Submarine volcanoes
Eruptions beneath the surface of a glacier
Subglacial volcanoes