Transcript Volcanoes: Mountains That Blow Their Tops

Volcanoes: Mountains That Blow
Their Tops
Informative Article
Building Background
There are two basic types of volcanoes:
a.) Fissure volcanoes
Volcanoes occur along cracks, or fissures, in
the earth’s crust. The volcanoes erupt quietly.
Lava just move slowly from the crack & spread
slowly.
b.) Central volcanoes
They explode from their central tube.
Connect 2 Ur Life
• Have you seen something in nature that was
very scary but also very exciting?
• What do you know about volcanoes?
• Is there something about volcanoes that you
would like to know more about?
• One way to deal with the volcanoes is by
learning enough about the phenomena to
protect ourselves.
Key 2 the Article
• Volcanoes: Mountains That Blow Their Tops is
an informative article.
• The writer uses both words & pictures to
explain how and why volcanoes happen.
• The pictures have captions = phrases or
sentences that help explain the pictures.
Words 2 Know
• Stirred v. caused something to happen
Past tense of stir. This word has more than one meaning:
(1) to mix by making a continuous circular movement (stir
sugar into coffee); (2) to rouse from sleep; (3) to excite
strong feelings in (Her good deed stirred the man’s heart)
• Fiery adj. full of fire
• Erupted v. exploded
P.S. Do your Workbook page 30
Context Clues
• Other words that surround the unfamiliar words.
1. The volcano erupted, throwing out lava, ash, and
steam.
“Throwing out lava, ash, and steam” defines
erupt.
2. A volcano is a vent in the earth’s crust.
“A vent in the earth’s crust” defines volcano.
P.S. Do you Workbook page 29
Context Clues
• At a volcano, magma spurts out the earth. In
other words, it shoots out quickly.
• Geologists, who are people who study rocks,
learn a lot from volcanoes.
• Volcano ash = debu preserved , that is, kept
safe, everything in old Pompeii.
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1
part
Pages 50-51, lines 1-48
VOCABULARY
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Line 21: crust = the top layer of the earth
Line 24: magma = melted rock
Line 37: crater = hole at the top of the volcano
Line 17: stirred things up
Line 43: turns back into
QUESTIONS
• What mountain exploded on the island of
Martinique?
Mont Pelee
• Where do volcanoes start?
deep in the earth.
• REREAD: How does a volcano start?
The magma finds a crack between plates that are
moving. Then it comes out.
QUESTIONS
• What is the main idea of the last paragraph on
page 51?
There are two kinds of lava.
• Use the fact about the earth’s layers to explain
what happened to Mont Pelee. (page 52)
The magma found a crack between plates. As it
moved through an opening to the top of the
mountain, the mountain shook and moved. When
it reached the top, it sent out as hot, fiery lava.
nd
2
part
Pages 52-53, lines 49-75
VOCABULARY
• Line 52: split open
• Line 54: shooting up
• Line 73: drive in
QUESTIONS
• What is the main idea of the second
paragraph?
Some islands are formed by volcanoes.
• Give one detail that supports the main idea in
the second paragraph.
Some volcanoes start at the bottom of the
ocean.
• Where is Mount St. Helens?
In the state of Washington.
QUESTIONS
• Which state in the USA has the biggest and
busiest volcanoes in the world?
Hawaii
• Hawaii is a state made up of islands. Explain
how these islands were probably made.
Ocean floor split, lava built until it rose above
water.
rd
3
part
Pages 54-55, lines 76-89
VOCABULARY
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Line 76: over time
Line 81: digging up
Line 86: dead
Line 88: sleeping
Line 86: inactive
Find the context clues that explain inactive.
QUESTIONS
Study the map in page 55. Answer this questions:
a.) How many areas with active volcanoes are
shown?
13
b.) Which of those areas are pictured as islands?
4, 8, 11, 13
• What is the main idea of this article?
to explain what volcanoes are and how they are
formed.
THINK IT THROUGH
• What good things do volcanoes do? What bad
things do they do? Use details from the article
to support your answer.
• Do people in the USA need to be concerned
about volcanoes? Why or why not?
• What are three facts you learned from reading
this article?
ANSWERS
• Good: lava & ash become rich soil for farming;
volcanic ash preserves living things & people
from the past.
• Bad: volcanoes eruptions cause death &
destruction.
• Most people in the USA don’t have to be
concerned. But those living near Mount St.
Helens in Washington, people living near
volcanoes in Hawaii and Alaska should be.
• Mont Pelee erupted in 1902, earth is made of
layers of rock, magma moves.
MAIN IDEA
• The most important idea in a paragraph.
• Often stated in a topic sentence.
• Often the first sentence in the paragraph.
Find out the main idea
My favorite kind of music is country. It has
many different beats and sounds. Many country
songs tell stories. I like country music from
different places. Country music is all over the
world now.
MAIN IDEA
My favorite kind of music is country. It has
many different beats and sounds. Many country
songs tell stories. I like country music from
different places. Country music is all over the
world now.
SUPPORTING DETAILS
My favorite kind of music is country. (2) It has
many different beats and sounds. (3) Many
country songs tell stories. I like country music
from different places. Country music is all over
the world now.
The 2nd & 3rd sentences gives reasons why the
writer enjoys country music.
SUPPORTING DETAILS
My favorite kind of music is country. It has
many different beats and sounds. Many
country songs tell stories. (4) I like country music
from different places. Country music is all over
the world now.
The 4th sentence explain which types of country
music the write likes.
SUPPORTING DETAILS
My favorite kind of music is country. It has
many different beats and sounds. Many
country songs tell stories. I like country music
from different places. (5) Country music is all over
the world now.
The last sentence explain where country music can
be found.
Write the Main idea & supporting
details
Movie theaters and movies have changed over
time. (1)About 100 years ago, there were no
movie theaters. (2) People with projectors went
from town to town instead.(3) Films were black
and white. (4) They had no sound. (5) By 1905,
some cities had movie theaters. (6) It cost five
cents to watch movies there.
One early movie was The Great Train Robbery.
It was made in 1903. It was about 10 minutes
long. It told an exciting story. People loved it!
Audiences still like action films.
Line 59
Some volcanoes start at the bottom of the
sea, where no one can see them. The ocean
floor splits open. Hot lava pours out. The lava
cool and hardens. The volcano grows. Slowly it
rises above the water. This is how some
islands are made.