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5th Grade

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Worksheet for 2026-09-27

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📖 Why Volcanoes Form at Some Boundaries

At some plate boundaries, one tectonic plate sinks beneath another. Water and other materials from the sinking plate can help mantle rock melt. Magma may rise because it is less dense than surrounding rock. If it reaches the surface, volcanic eruptions can occur.

1. What key idea begins the explanation?

 

2. What mechanism or supporting detail is described?

 

3. What additional evidence or effect is given?

 

4. How does the final detail deepen the explanation?

 

✏️ Writing

Write 1–2 developed paragraphs explaining why volcanoes form at some boundaries. Use evidence and cause-and-effect reasoning.

➕ Math

1. A rectangular prism is 3 × 4 × 6. Find its volume: ______
2. What is the area of a 3 × 4 rectangle? ______
3. Plotting (3, 5): which number tells how far right to move? ______
4. In the coordinate pair (4, 7), what is the y-coordinate? ______

🎨 Color & Create

Create a labeled model or diagram that explains why volcanoes form at some boundaries.

View Answer Key

📖 Reading Answers

  1. At some plate boundaries, one tectonic plate sinks beneath another.
  2. Water and other materials from the sinking plate can help mantle rock melt.
  3. Magma may rise because it is less dense than surrounding rock.
  4. If it reaches the surface, volcanic eruptions can occur.

➕ Math Answers

  1. 72
  2. 12
  3. 3
  4. 7

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