Curriculum Resources
Take learning to the next level and transform the way you teach with a vast library of ready-to-use, standards-aligned, adaptable curriculum resources. The resources listed below are either available with an Online Learning Subscription which allows you to instruct, assess and track student performance or as individual hands-on classroom resources which can be purchased. Choose from Multimedia Lessons, Curriculum Mastery Games, Flip Charts, Visual Learning Guides, Flash Cards, Vocabulary Cards, and Curriculum Modules available on our online store. PREMIUM ONLINE LEARNING SUBSCRIPTION OPTIONS
  • Select By Standard
  • BROWSE CURRICULUM
    • General Science
    • Life Science / Biology
    • Human Body
    • Earth Science
    • Physical Science
    • Chemistry
    • Math
    • Language Arts
    • Social Studies
 

Volcanic Eruptions

Science, Grade 6

Back
 

Table Of Contents: Volcanic Eruptions

1. Inside a Volcano
Beneath the surface of a volcano is a magma reservoir where rock that is exposed to heat and pressure changes into magma. A long tube through the crust called a pipe connects the reservoir to the surface.
2. Vents and Craters
Lava flows out onto the surface through an opening called a vent. Some volcanoes form smaller side vents where lava and gases escape. A cone-shaped depression called a crater often forms during explosive eruptions.
3. Why Does a Volcano Erupt?
When magma rises toward the surface, gas bubbles expand and increase in pressure. The force of the gas pushes the magma out of the vent and causes an eruption.
4. Quiet Eruptions
There are two types of eruptions—quiet and explosive. Quiet eruptions are non-explosive and occur in volcanoes with low-viscosity, low-silica magma. The fast-moving lava flows out of the vent and across the surface of the land.
5. Explosive Eruptions
Explosive eruptions occur in volcanoes with thick, high-viscosity magma that is high in silica. Magma builds up within the volcano's pipe rather than flowing out. Pressure increases until an explosive eruption occurs.
6. Pyroclastic Flow and Lahar
Explosive eruptions release a mixture called a pyroclastic flow made up of hot ash, rocks and gases. A fast-moving mudflow called a lahar can also form during an explosive eruption.
7. Volcanic Material and Rocks
Volcanic material can be found in all different sizes from tiny ash particles, to cinders, to large pieces called volcanic bombs. Obsidian, pumice, basalt, and rhyolite are all igneous rocks that form from volcanic eruptions.
© Copyright 2012-2018 NewPath Learning. All Rights Reserved. Privacy Notice * Terms of Use