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What Are the Cascade Range Volcanoes

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Format: Interactive (Online), Printable (PDF)
Grades: 5678
Subjects: scienceela
Standards: MS-ESS2-3
Languages: English, Spanish

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Reading passage

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About this reader

This 400-500 word informational science passage explores the Cascade Range volcanoes for middle school students in grades 6-8. Students learn about the location of these composite volcanoes, including Mount Rainier, Mount Hood, Mount Shasta, and Mount St. Helens. The passage explains how plate tectonics creates these dangerous peaks through subduction of the Juan de Fuca plate beneath the North American plate. Students discover why these volcanoes remain active threats to millions of people living nearby. The content aligns with NGSS standards MS-ESS2-3 and MS-ESS2.B, focusing on plate tectonics and Earth's systems. Audio-integrated features support diverse learners, including English Language Learners and struggling readers. Activities include reading comprehension questions, writing prompts, and graphic organizers that reinforce understanding of cause-and-effect relationships in volcanic formation and the sequence of subduction processes.

Written by Workybooks TeamPublished by Workybooks

Sample passage and quiz content

CONTENT PREVIEW

"Cascade Range map" by Lyn Topinka, USGS; modified from Tilling, et al., 1990 / Wikimedia Commons.

The Cascade Range is a chain of tall, steep volcanoes stretching from northern California through Oregon and Washington into Canada. These mountains include famous peaks such as Mount Rainier, Mount Hood, Mount Shasta, and Mount St. Helens. Scientists classify these volcanoes as composite volcanoes, which are cone-shaped mountains built from layers of lava and ash. The Cascade volcanoes form a line roughly parallel to the Pacific coast, and they exist because of powerful forces beneath Earth's surface.

The Cascade Range volcanoes form because of plate tectonics, the movement of giant slabs of Earth's outer layer. Just off the Pacific Northwest coast, a small piece of ocean floor called the Juan de Fuca plate slowly moves eastward. This oceanic plate collides with the much larger North American plate, which carries the continent. Because the oceanic plate is denser and heavier, it bends downward and slides beneath the continental plate. Scientists call this process subduction. As the Juan de Fuca plate descends into Earth's hot interior, temperatures and pressures increase. Water trapped in the oceanic plate's rocks lowers the melting point of surrounding material. This process creates magma, which is molten rock beneath Earth's surface. The magma is less dense than surrounding rock, so it rises slowly upward through cracks in the overlying plate. When magma reaches the surface and erupts, it builds composite volcanoes over thousands of years.

The Cascade volcanoes may look peaceful, but evidence shows they remain dangerous. Mount St. Helens erupted violently in 1980, killing 57 people and destroying hundreds of square miles of forest. The eruption sent ash across multiple states and demonstrated that Cascade volcanoes are not extinct. Scientists monitor these peaks carefully because many are dormant, not dead. Mount Rainier towers over the Seattle metropolitan area, where more than three million people live. An eruption there could trigger massive lahars, which are fast-moving flows of volcanic mud and debris. These lahars can travel down river valleys for dozens of miles, threatening communities far from the volcano itself.

Understanding the Cascade Range matters because millions of people live near these volcanoes. The same subduction process that created these mountains continues today. The Juan de Fuca plate still pushes beneath North America at about the same rate your fingernails grow. This means the Cascade volcanoes will erupt again, though scientists cannot predict exactly when. Studying these volcanoes helps communities prepare for future eruptions and reduces risks to human life and property.

Interesting Fact: Mount Rainier is considered one of the most dangerous volcanoes in the United States, not because it erupts frequently, but because it is covered in glaciers that could melt rapidly during an eruption and create catastrophic lahars.

What type of volcanoes make up the Cascade Range?

Shield volcanoesComposite volcanoesCinder cone volcanoesUnderwater volcanoes

Which tectonic plate is subducting beneath the North American plate to create the Cascade volcanoes?

Pacific plateJuan de Fuca plateCocos plateCaribbean plate

What does the term 'subduction' mean in the context of plate tectonics?

Two plates moving away from each otherTwo plates sliding past each other horizontallyOne plate sinking beneath another plateTwo plates colliding and forming mountains

Why does magma form when the Juan de Fuca plate subducts?

The plate melts completely from frictionWater in the rocks lowers the melting point of surrounding materialThe plate brings cold water that creates steamEarthquakes generate enough heat to melt rock

What are lahars?

Types of volcanic rocksFast-moving flows of volcanic mud and debrisClouds of volcanic ashUnderground rivers of magma

Why is Mount Rainier considered particularly dangerous?

It erupts more frequently than other Cascade volcanoesIt is the tallest volcano in North AmericaIt is near a major city and covered in glaciers that could create laharsIt has more magma beneath it than any other volcano

Which volcano erupted in 1980, demonstrating that Cascade volcanoes remain active?

Mount RainierMount HoodMount ShastaMount St. Helens

How does the density of magma compare to the surrounding solid rock?

Magma is denser, so it sinks deeperMagma is less dense, so it rises upwardMagma has the same density as solid rockMagma density changes randomly

True or False: The Cascade volcanoes are extinct and will never erupt again.

TrueFalse

True or False: The Juan de Fuca plate is still moving and subducting beneath North America today.

TrueFalse