Download Inside Earth 3-2 Worksheets 2013

3-2 Volcanic Activity (pp. 93-102)
∆How Magma Reaches Earth’s Surface (pp. 93-94)
Magma forms in the a___________________.
Just like a soda bottle that’s been shaken, gases that are dissolved
in magma rush out and carry magma with them.
Liquid magma rises until it reaches the s________________, or until it
becomes t___________ beneath layers of rock.
Magma can be:
Thick
S_______
Flows slowly
or
L_____ colored
Forms rhyolite(g_____)
Pumice, & obsidian
E_________ eruptions
Dissolved gases can’t
escape so the pressure
Builds, & Builds & BUILDS
Until it EXPLODES!!!
Pyroclastic f______
-volcanic ash, cinders &
bombs,
Mt. St. Helens, WA
Thin
r______, oozes out
& flows easily
like water
d____ silica
forms b______
q_______ eruptions
erupts
regularly
2 types:
P_________________ -fast
moving lava
swirls, w_____________
A__ – cooler,
Moves slowly,
Hardens into a
Rough surface
J____________ lava
Chunks
Hawaii
∆Inside a Volcano (p. 94-95)
Fill in the blanks in the diagram of a volcano below.
Lava Flow – the area c________ by lava as it pours out of a v_______
The Crater – forms at the top of a volcano around the central v____
The Pipe – is a v___________crack in the crust
∆Characteristics of Magma (p. 96)
The Four Factors that determine the force of a volcanic eruption
are:
1. amount of g__ dissolved in the magma
2. how t_______or thin the magma is
3. its t________________
4. its s________ content
Silica
Silica in magma makes it t_______
l___________ in color.
and makes it
Match the type of rock with its description:
_____ rhyolite
A. has the same composition as granite
_____ obsidian
B. forms from low-silica lava
_____ pumice
C. Forms when high-silica lava cools very quickly
_____ basalt
D. Forms when gas bubbles are trapped in cooling lava
∆Types of Volcanic Eruptions (pp. 97-98)
Hot, fast-moving lava is called _______________________. 
Cool, slow-moving lava is called _____. 
Draw a line matching the type of lava with its description:
Volcanic ash
Cinders
Bombs
pebble-sized particle
particles ranging in size from a baseball to a car
fine rocky particles as small as a grain of sand
Pyroclastic Flow is an e___________________ eruption of ash,
c______________, bombs, and gases.
∆Stages of a Volcano (p. 98)
Did you know??? A volcano can be active from less than a
decade to more than 10 million years! WOW!
Describe the 3 Stages in a volcano’s life:
Active – ________________________________________________________
_________________________________________________________________
Dormant – _____________________________________________________
_________________________________________________________________
Extinct – _______________________________________________________
_________________________________________________________________
Which type of volcano would you like to live near? Why?
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
∆Other Types of Volcanic Activity (p. 98)
Does all volcanic activity involve eruptions of lava? _______________
2 Types of volcanic activity that do not involve eruptions of lava:
hot springs and geysers
How do hot springs form? ________________________________________
_________________________________________________________________
_________________________________________________________________
-may contain gases and other substances from deep within the
Earth
-Yellowstone Paint Pots and hot springs
Geysers – rising water and s________________ become trapped
underground in a narrow crack. P____________________ builds until
it sprays like a fountain above the surface
-Yellowstone’s Old Faithful
Geothermal energy – in volcanic areas – water heated by
m_____________ can provide a clean, reliable energy source
(Iceland) (turbines like at NYPA)
People pipe this hot water right into their homes for warmth and
electricity
∆Monitoring Volcanoes (pp. 100-101)
Monitoring volcanoes – easier for geologists than earthquakes –
because there are usually signs/warnings that a volcano will erupt
-pimples
What are some changes or clues that geologists look for when they
are monitoring volcanoes?
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
However, geologists cannot predict what type of eruption a volcano will produce, an
explosive pyroclastic flow, or a quiet, lava flow.
∆ Volcano Hazards (pp. 101-102)
Dangers?!
quiet eruptions pour out LOTS of l_________ that buries
everything in its way
explosive eruption – volcanic ash belches out clouds of
hot burning gases, ash, cinders, and bombs that b________ towns,
damage crops – clog engines – cover nearby roofs causing them
to c_______________, cause landslides and mudslides