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Study Guide Answers

Directions:     Match the following definitions with their appropriate terms:

A. Patron god of volcanoes whose workshop was thought to be inside a volcano
B. The constant movement of large blocks of earth's crustal material
C. The outer layer of rocks in the earth's crust
D. Molten rock that becomes lava when emitted by a volcano
E. Inclusive term for all rocks formed by molten rock that has cooled
F. Volcanic glass
G. Lava that hardens to a rough, broken surface
H. Lava that has a smooth, ropy surface
I. All solid, fragmentary material ejected during a volcanic eruption
J. The largest solid material ejected during an eruption
K. Broad-based, gently sloping volcanoes built up by repeated, overlapping lava flows
L. Steep-sided volcanoes formed by the accumulation of pyroclastics near the vent
M. Volcanic domes
N . Composite volcanoes built up by alternate layers of lava flows and pyroclastic materials
O. The solidified mudflow of meltwater and volcanic ash
P. Deadly superheated mixture of hot gases and fine ash that speeds down the slopes of a volcano
Q. Funnel-shaped pit at the top of a volcanic cone
R. Depression caused by the collapse of the top of a volcanic cone
S. The most common geothermal phenomenon
T. Geothermal vents that emit steam, sometimes combined with volcanic gases
U. Geothermal vents that periodically spout columns of hot water and steam
V. Volcanoes with no recent history of eruption
W. Large areas of solidified magma that originated beneath the earth; have often created mountains by exerting pressure and have even become exposed after erosion has worn away less resistant material
X. Oval domes formed when stiff magma builds up between horizontal layers of pre-existing rock and lifts up the overlying strata
Y. Solidified magma that was formed when forced into vertical fissures in the earth's crust and which takes on a wall-like appearance when exposed by erosion
     Answer Key
1.     _____Cinder Cones
     L
2.     _____Lithosphere
     c
3.     _____Dikes
     Y
4.     _____Lahar
     O
5.     _____Pahoehoe
     H
6.     _____Caldera
     R
7.     _____Obsidian
     F
8.     _____Geysers
     U
9.     _____Plate Tectonics
     B
10.     _____Fumaroles
     T
11.     _____Stratovolcanoes
     N
12.     _____Pyroclastics
     I
13.     _____Laccoliths
     X
14.     _____Crater
     Q
15.     _____Magma
     D
16.     _____Hot Springs
     S
17.     _____Shield Volcanoes
     K
18.     _____Volcanic Bombs
     J
19.     _____Vulcan
     A
20.     _____Nuée Ardente
     P
21.     _____Batholiths
     W
22.     _____Aa
     G
23.     _____Dormant Volcanoes
     V
24.     _____Plug Volcanoes
     M
25.     _____Igneous Rock
     E
© Educational Video Network, Inc. 2005 - www.evndirect.com
Your leading source for curriculum-based educational videos and DVDs.