CHAPTER 6 - VOLCANOES
CLUE REVIEW (WRITE THE ANSWER, HIGHLIGHT THE ANSWER IN YOUR BOOK, WRITE PAGE NO.)
1. WHERE YOU WOULD MOST LIKELY FIND VOLCANOES along a mid-ocean ridge and where plates
subduct p.198
2. BATHOLITH___refer to no. 30 page 213
3. BEFORE LAVA REACHES THE SURFACE IS THE MOLTEN MATERIAL magma page 196
4. MAGMA FORCES THE LAYERS OF ROCK TO BEND UPWARD INTO A LANDFORM dome mountain
page 213
5. SILCA CONTENT OF MAGMA IS THE MAIN FACTOR that accounts for the difference between
quiet and explosive eruptions
6. A HUGE HOLE LEFT WHEN THE ROOF OF AVOLCANIC MOUNTAIN’S MAGMA CHAMBER
COLLAPSES caldera page 209
7. MAIN HAZARD FROM A QUIET VOLCANIC ERUTION lava flow page 203
8. VOLCANIC ASH Small lava fragments produced by an explosive eruption p.204
9. DISSOLVED GASES TRAPPED IN THE MAGMA What provides the force that causes magma to
erupt to the surface. Page204
10. CRATER Bowl shaped area around a volcano’s central vent page 201
11. VOLCANO HAZARDS THAT ARE MADE UP OF FINE ROCKY PARTICLES AS SMALL AS A SPECK OF
DUST Volcanic ash p 204
12. A STRING OF ISLANDS THAT CAN FORM FROM THE COLISION OF TWO OCEANIC PLATES Island
Arc page 198
13. GEOLOGISTS DETECTING MANY SMALL EARTHQUAKES IN THE AREA NEAR A VOLCANO, THE
GEOLOGIST CAN IFER THIS That a volcano may be ready to erupt upward movement triggers
these earthquakes. Page 206
14. A MAJOR VOLCANIC BELT THAT CIRCLES THE PACIFIC OCEAN Ring of Fire page 197
15. COMPOSITE VOLCANOES Tall cone shaped mountains in which layers of lava alternate with
layers of ash. Page210
16. ASH, CINDERS, AND BOMBS BUILD UP IN A STEEP PILE TO FROM THESE KIND OF VOLCANOES
Cinder Cone page 210
17. LAVA PLATEAU Many layers of thin, runny lava build up a high level area. Page 210
18. A VOLCANO THAT IS ERUPTING OR MAY ERUPT IN THE NEAR FUTURE Active Volcano page 206
19. CALDERA Huge hole left by the collapse of a volcanic mountain. Page 206
20. PYROCLASTIC FLOW OCCURS DURING AN EXPLOSIVE ERUPTION A mixture of hot gases, ash
cinders and bombs flow down when it erupts explosively. Page 205
21. ASH, CINDERS, AND BOMBS BUILD UP IN A STEEP PILE AROUND A VOLCANO’S VENT Cinder Cone
page 210
22. MAGMA FORCING ITS WAY OUT OF THE SIDE OF A VOLCANO THROUGH THIS Central Vent, Side
Vent page 201
23. MAGMA HARDENS IN A VOLCANO’S PIPE, IT WILL EVENTUALLY BE A LANDFORM Volcanic Neck
page 212
24. VOLCANOES FORM ALONG A MID-OCEAN RIDGE WILL OCCUR AT THIS BOUNDARY Diverging
plate boundaries page 198
Cinder Cones page 210
Volcanoes erupt explosively
producing ash, cinders, and bombs.
These materials can build up around
the vent in steep cone-shaped hill or
small mountain called a cinder cone.
25.
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Composite Volcano page 210
Tall, cone shaped moutains in which
layers of lava alternate with layers of
ash. Quiet and explosive
26.
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Shield Volcano page 210
Thin layers of lava pour out of a vent
and harden on top of previous layers.
Such lava flows slowly building a
wide gentle slope mountain. Quiet
27.
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Lava Plateau page 211
28.
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Lava can flow out of several long
cracks in an area. The thin, runy laa
floods the area and travels far before
cooling and becoming solid.
Repeated floods of lava can form
high plateaus.
Caldera page 209
A hole left when a volcano collapses.
A lake can form filling the hole.
29.
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Batholith page 213
A mass of rock formed when a large
body of magma cools inside the
crust. Forms the core of many
mountain ranges.
30.
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Dike page 212
Magma that forces itself across rock
layers.
31.
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Sill page 212
Magma that squeezes between rock
layers and hardens.
32.
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Volcanic neck page 212
Magma hardens in a volcano’s pipe
and the surround rock layer wears
always.
33.
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