Features of a Volcano

Butihen Monique Charlene · 6問 · 2年前

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The features of a volcano are almost the same as that of a ______ but with more complicated parts.

mountain

the most striking part of the volcano

Cone

usually composed of mixtures of lava and pyroclastic.

Cone

Cone Viscous and slow-moving granitic magma forms _________; While fast moving basaltic magma creates 2._____________.

1. high-sided steep cones, 2. low to almost flat cones

the opening through which an eruption takes place.

Vent

This main part of a volcano supplies the magma from the underlying source to the top of the volcano.

Vent

Vent can be ____ & ____

straight and convoluted

the 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

a volcanic depression much larger than the original crater.

Caldera

the rock or magma expelled from a volcano during eruption.

Lava

Lava has temperature upon ejection can reach up to _____, hence it flows until it cools and hardens.

700°C

the barrier or obstacles in a volcano.

Dikes

are found in igneous forms which, under great pressure, cut fractures or fissures across previously formed metamorphic, sedimentary or igneous rocks.

Dikes

Sills otherwise known as ___

intrusive sheets

they 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 side of a volcano

Flank

the highest point or apex of a volcano

Summit

the entrance of a volcano

Throat

expelled in the atmosphere which composed of pulverized rock and glass created during eruption

Ash cloud of Volcanic Ash

the chunks of lava blasted into the air which solidify before reaching the ground

Volcanic bombs

Volcanic bombs sizes may vary and can measure up to ___ in diameter

64cm

fast moving currents of hot gases and rock travelling downhill from a volcano.

Pyroclastic flow

Pyroclastic flow includes pumice flow, ash flow, block and ash flow, glowing and erupting clouds called ______ and _____.

nuee ardente and avalanche

Pyroclastic Flow, In terms of size particles with less than 2 mm diameter are called ____; with 2-64mm in diameter are called ____; those bigger than 64mm in diameter are called _____ and ____.

ashes, lapilli, blocks and bombs

refers to fragmented material that consists of pumice, scoria, lithic materials or crystals or combination of the four.

Tephra fall

they are flowing mixture of volcanic debris and water

Lahar

They are classified as primary or hot when associated with volcanic eruption, or as cold lahar when they are caused by heavy rainfall.

Lahar

Lahar also called _____

mudflows

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