Anatomy of a Volcano

Name ------~~----------~------- Hour _

1. How many people died because of the 1980 eruption of Mt. St. Helens? _-,...-- __

2. What two gases were scientists trying to use to determine when Mt. St. Helens would erupt?

A. H. .:.-....,._""""":'"-"_3. What two types of plate boundaries are found on the western United States coast?

A. B. _4. What mountain range in the continental U. S. isthe only one that has relatively active

volcanic activity? _

5~ Some people believe that their predicted the eruption ofMt. St.Helens.

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6. Name two things that the volcano spewed or threw out of the volcano besides pumice.

A. _ B. ~ _

7. What finally triggered the major eruption ofMt St Helens?

8. The very dense cloud of volcanic material knocked over trees by traveling as slow as _miles per hour. .

9. "--. of a cubic mile was missing from fuemountain after the blast..,

10. 600,000 tons of ash fell on the city of__ ~ _11. In the actual blast area, wildlife survived.------12. People viewed the scientist's job as one purpose. What was that perceived job?

13. Were the scientists successful in accomplishing their perceived task or job? ( Yes / No)Explain your answer

~ .14. Inside the actual blast area, death was caused by

(Heat ;. Ash asphyxiation ).Choking

'\Date

CHAPTER 10 Volcanoes and Volcanic Activity

•••• att.r Sac:1Ion 10-5.

Part A. Find the numbered features in the drawing. Write the name of each feature in the correctspace below. Then answer the questions.

3.6.

2.5.

1.

4.

7.8. Where might magma rise to the e~rth·s surface?

I. What happens to magma that reaches the surface?

Part B. Complete the chart below about the five intrusive features of volcanoes. Use the drawingas reference.

Intrusive Feature Description

Batholith

Stock

Sill

Dike -Laccolith

1AME...;;,.-. DATE -'-- CLASS )REINFORCEMENT

") ErupilOns ana-Forms-'ofVol(c:JnoesC!:ar=15_. __

-_. ---,-- -r--r-r-r-r-r-r--r-: --- ---"'---'--'----

IdmtifJ MChfumiofwiumo and thenfilHn the cluzrt with tJae.appnipriateinf01'1tUJlion-.t etUhJonIL' .. ' .

Lava floWs

FIGURE 1 FIGURE 2 FIGURE 3'

Fonnofvolcano

Shape ofvolcano

Materials Involcano

Type ofmagma

1.

2.

3. ./..

AnJUItT thefollowing questions on the lin:espruuided .:. .

4. What is the-relationship between theamowiTOfgaseS1nCiiiagilia-ind theexplosiVenesHjr-a----"r-"'~--- ---c---.~-~."- _

volcanic eruption? ---:---i----:--'-"----""'-"" ..-""'-"'..""--•...."".--"""'"~~~~-'- _

. -, . ~' ..

5~_~a~ _is.~~_~~lationshipbe~eenthe silica-con~nt ofIDagma-aiiCi'theexplomenesS ora volcanicemption? ----- .....---- ... -.-.-.--- - ---:-=:~:-:----:---.--.-..------.-.-.----. ------.-:

57

CHAt. .c.VlEV-I__ -",- -,-_ DAl£ OASS _

Chaptw15 .

VokanoesPart A. Vocabulary ReviewMatch 1M ckscriptions in Column I with their terms in Column Il. WriU the letter of 1M wmct term or ph-rosein the blank at the left. .

Column I1. Heat from magma used to heat water and produce steam

for powering electric generators

2. Basaltic volcano with gently sloping sides

!S. Largest intrusive igneous rock. bodies

4. Volcano formed from alternating layers of lava and tephra

s. Magma hardened in a vertical crack

6. Magma hardened in a horizontal crack

7. Openings through which magma flows out on Earth'ssurface

8. Steep-sided volcano made of tephra

9. Solid magma core exposed when volcano cone erodesaway

__ 10. Hot area in Earth's mantle that melts rock into magma'

__ 11. Mountain that forms from layers of lava and ash

__ 12. Large opening caused by the collapse of the top of avolcano

__ 1!S. Area around the Pacific plate where it collides with other.plates

__ .14. Ash and cinders blown violently out of volcanoes

__ 15. Opening at the top of a volcano's vent

__ 16. Magma in a sill which pushes up to form a rock dome

Column IIa. batholiths

b. caldera

c. cinder cone

d. composite volcano

e. crater

f. dike

g. geothermal energy

h. hot spot

i. laccolith

j. Pacific Ring of Fire

It. shield volcano

1. sill

m, tephra

n. vents

o. volcanic neck

p. volcano

.lart 8. Concept Review·4n.swer the questians on 1M lines prr:ruided.

t. list two arguments for using geothermal energy to produce electricity, _

<b. magma surrounds a cone dIirlngifaw.-flow ,Co magma en~rs avertical crack and hardens)d. m-agma forms a horizontal sheet (j) ~ r-s (}.;..~ j I{

;'

.2. A laccolith is created when __ .a. lava forms a thick sheet

. b. lava fills a vente, magma forms a sheet and a domed. magma in a sill pushes up to form a rock dome

S. A mountain that forms when layers of lava and ash erupt and build up is a -. - .a. caldera b. volcano c. vent d. batholith

4. Hot spots occur at __ .a. locations not at plate boundariesb. divergent plate boundaries

Co convergent plate boundariesd. cinder cones

5. Kilauea in Hawaii is the world's most .;__ vol~o.a. dormant b. active ~ c, Violent d. granitic

6. Some people say that using geothermal energy in Hawaii woul~ re~uce -- .a. air pollution . c. the danger of oil spillsb. dependence on fossil fuels d. all of these

7. One factor that detellliines. whether a volcano eruption will be quiet or explosiveis __ ,a. the number of cinder cones presentb the height of the volcano's ventc, the amount of water vapor and other gases trapped in the magmad. the amount of tephra. in the magma

8. Some people say that'using geothermal energy in ~waii could' damage the --'. ality b ram' forests Co enVlronment d. all of thesea. arrqu •

9. Mount Saint Helens is an example of a __ .volc:mo,a. composite b. cinder cone c. shield

__ 10•.Ship Rock in New Mexico is an example of a --' .a. caldera b. volcanic neck Co laccolith

IdmtifJ each type of volca.M and describe haw it's fOTTMd. 7/15;3

d. Hawaiian

do batholith

FIGURE 1

. It's formed by _5. FiltUre 1 is a --------

33

____ -------.It'sfonnedby .•...----------6. Figure 2 is a. It's formed by -'--------7. Figure 3 is a -

~--,...'"I .__ .__~. >,:;J>"~'_:-,~J~_-:-;":,,,,_.. _.

STUDY GUIbE.~~~.~Eruptions aM {~ of VolcanoeS .'

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STUDY GUIDE"

I••*Mlntlc,., ¥.••.• "'.tj. tmt., JIIn$I"'.~ ~ Md" ' •••.

_ I, Maaes~~chat~~:andtonn:~'~~nd~

<~~' '..' .~1accOlidJS··--'~-· .

'f. Ship Rock;Q Sew MeXico is an ecampIe ~ a_ ~•• laccolith ~. 1IOk:anic ned .

'-!Wost igneous actni~' tabs.~ --.:. .. a. undergrou~d. . b. abtwc ground

•• ~atha.t Squeez~ into a horizontal cr:tckand ~ens forms.a-.:..........;_a. dike . " b~sill

5. When the lOp of;l volcano cotlapses into the ~·cnt. :l _ is formed.a. crater . b. caldera

6• .\ dome of rock pushed up bl- a magmaliill is 01 ~ •a. batholith b. m(.(..)iith

1. '-olunk fe;lWfcS th31 c:ut Sbtncnmes be seen :abUlic ground O1CC __ •

. a. \"OlCll1ic nuks and b:uholidlS b. dikes :tndsills

~5~.~e$l-siud tephra6;: 'type of magmacoinaming a lot of silica .

. anchi'ater vapOr '.a.Volc;ano made of altetnaringta,ers ofm-a

lO.·:=:~.throWn outduring.' •.'. ~9JiS.".··:i·.· ..... . .'n. ~ lhat~t ~e cxplosh'cnel&o('

'. VOlcmikiruptions.~: . ..'

'1-. .Doym .. I-

. l.S'~d volcan() ma4e-mtqilira' .' ~'(2~L_._· -' - ... -::........ ..,"-"'-7'

'. .' 2. Typeiim.agma con~ lit,tie silica' .. ' . ,

~••-MineraI ~~a~ ~~iliidness'oi"~·~·l...__.,IO~·\\nc:il ~on \~rs ~""" tilt! outside of:1 \-olanu. !01ncti~s IISOlidng~ ~or('c:J'magma ",/ ' . a _IS ldt,apowd. .

5. M~ tepl.lril.i a. tiltde!' ceae b. ~oic.micn~ck7.~~tepiml·. . ' .. ' .. '9.' ~ioadvolano ~e or:t1ai~n of ., basaltic~.~ ..~

~,ll.Th~,gr:lIli~ donIcis in \o~ite ~ario~'hck in:Califotnm afc part of a ~ _ .: .,~:'. . '.: biadtolith;. ", '. . . b~.Sill .

~ iiV~G.!s~'~plcs of isn~us ac:li\ily__....,. ", " . " , , .-. " . . ...,.,..•• u..n.de---.....4 . II. ah«n:.-e - •.•••nd .I1nswrtituJuestirm.iJl.tMsf'O«f1rOVidaL '. . . . '. "a'-- e---

I!. T~:iin~t factors ~ewhether an eruption will.be~~ or quie~.~.i~~. ~··l!. lbgrrta that cools undetgroundro~~ igneous~k.··.tbey?_~ --:-_:-:-:-_""-- •• extr'USh-e .' b. in~-e ' ._ ..__~'

!--~ l""ThediiTm';~'~~';n'dr=tt!$a~d~·~ ,-~-.j)f ~heirformauon.------------------~--:-~-.-.~-.-.~-'~.---:-~-~~7~~'-~~~.C:'.~

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8. ~I:lgm:l th:lt 1qu~ into :1~'tttic::llct3Ck :Iud h.vdcns forms :J _.2. dike b. sill

9. Crater Lake in Oregon is :m example t>f;& --.,-. • '...'a. dike . b. QI~r:t