Volcanoes: Mountains That Blow Their Tops

Informative Article

Building BackgroundThere 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 volcanoesThey 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 happenPast 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.

1st part

Pages 50-51, lines 1-48

VOCABULARY

• 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.

2nd 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.

3rd part

Pages 54-55, lines 76-89

VOCABULARY

• 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?

13b.) 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.