Features of a volcano Flashcards
The entrance of a volcano
Throat
The most striking part of the volcano.
Cone
The large underground pool of liquid rock found beneath the Earth’s crust.
Magma Chamber
Sills is also known as
Intrusive sheets
The rock or magma expelled from a volcano during eruption.
Lava
In lava, the temperature upon EJECTION can reach up to
700°C
A basin-like depression over a vent at the summit of the cone
Crater
It is usually composed of mixtures of lava and pyrocalstic. It can also vary in size and shape depending on the type of magma that is ejected by a particular volcano.
Cone
The highest point or apex of a volcano
Summit
The side of a volcano
Flank
A volcanic depression much larger that the original crater
Caldera
Are found in igneous forms that under great pressure, cut fractures or fissures across previously formed metamorphic, sedimentary, or igneous rocks.
Dikes
Are solidified lava flows that originally forced their way between and parallel to older layers of rocks
Sills
A channel or pipe conveying liquid materials such as magma
Conduit
The opening through which an eruption takes place.
Vent
The barrier or obstacles in a volcano.
Dikes
Expelled in the atmoshpere
Ash cloud
Also called mudflows
Lahar
Also called mudflows
Lahar
Fast-moving currents of hot gases and rock travelling downhill from a volcano.
Pyroclastic flow
Is composed of pulverized rock and glass created during eruption.
Ash cloud
The chunks of lava blasted into the air which solidify before reaching the ground.
Volcanic Bombs
Glowing eruption cloud called
Nuee Ardent and avalanche
Refers to fragmented material that consists of pumice, scoria, lithic materials, or crystals, or combination of the four.
Tephra fall
Particles less than 2mm diameter is called
Ash
Particles that measure 2-64 are called
Lapilli
Particles bigger than 64 m in diameter are called
Blocks and bombs
They are classified as primary or hot which are directly associated with volcanic eruption or cold when they are caused by heavy rainfall.
Lahar
This main part of a volcano supplies the magma from the underlying source to the top of the volcano.
Vent
They can be straight or convoluted.
Vent
Are flowing mixture of volcanic debris and water.
Lahar
