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SECTION VOLCANOES FORM AS MOLTEN ROCK ERUPTS. 3.2 Reinforcing Key Concepts BIG IDEA Mountains KEY CONCEPT and valleys form as tectonic plates move. Volcanoes form as molten rock erupts. 1. Volcanoes erupt many types of material. Some of the heat inside Earth escapes to the surface through volcanoes. A volcano is an opening in Earth’s crust through which many types of materials erupt. The table below describes different types of volcanic materials. Complete the table by filling in the missing information. Molten Rock Rock Fragments cinders CHAPTER 3 Mountains and Volcanoes molten rock after it erupts tiny rock fragments less than 2 mm in size main gases in magma 2. Most volcanoes form along plate boundaries. What are three areas where volcanoes are likely to form? 3. Volcanoes can be many shapes and sizes. The drawing below shows a cross section of a volcano. What type of volcano is this? How can you tell? 4. Scientists monitor volcanoes. What Copyright © by McDougal Littell, a division of Houghton Mifflin Company magma Volcanic Gases indications do scientists use to predict a possible volcanic eruption? 162 THE CHANGING EARTH, CHAPTER 3, REINFORCING KEY CONCEPTS 162-162-sean-urb-b0302-rkc 162 3/11/04, 9:07:48 AM