Copyright 2009 abcteach.com Volcanoes Copyright 2009 abcteach.com
Earth is like an apple. They are both round. Copyright 2009 abcteach.com
Copyright 2009 abcteach.com If you cut an apple in half, you will see different layers. The center of the apple is the core. core Copyright 2009 abcteach.com
The center of Earth is also called the core. Copyright 2009 abcteach.com
The outside layer of an apple is the skin. The skin is thin. Copyright 2009 abcteach.com
The outside crust of Earth is thin like the skin of an apple. Copyright 2009 abcteach.com
Copyright 2009 abcteach.com Between Earth’s core and the crust is the mantle. The mantle contains melted rock called magma. mantle Copyright 2009 abcteach.com
Copyright 2009 abcteach.com Sometimes, the magma inside Earth builds up pressure and begins to push up. Copyright 2009 abcteach.com
Copyright 2009 abcteach.com The magma bursts through Earth’s thin crust. We call this bursting magma lava. Lava, ash, steam, and rocks all escape through openings in Earth’s crust. Copyright 2009 abcteach.com
Copyright 2009 abcteach.com These openings are called volcanoes. A volcano can have one or more openings, or vents. vents Copyright 2009 abcteach.com
When lava escapes from a volcano, the volcano is erupting. Copyright 2009 abcteach.com
A volcano gives some hints before it erupts. Steam, gas, and little spurts of lava show that the volcano is active. Copyright 2009 abcteach.com
Copyright 2009 abcteach.com Some volcanoes do not erupt for many years. These volcanoes are dormant. Copyright 2009 abcteach.com
Some volcanoes will not erupt again. These volcanoes are extinct. Copyright 2009 abcteach.com
Copyright 2009 abcteach.com Volcanoes can be dangerous. The gases that are released during an eruption can be poisonous. Eruptions may change the way the land looks. Eruptions may destroy trees, homes, and other structures. Copyright 2009 abcteach.com
Copyright 2009 abcteach.com A volcano even changes itself when it erupts. It may get bigger as lava, cinder, and ash are added to its slopes. It may have a crater at the top. It may collapse and leave a bowl-shaped hole in the ground. Copyright 2009 abcteach.com
Volcanoes can form new islands. Hawaii The Hawaiian Islands are volcanic, meaning they were made by volcanoes. Copyright 2009 abcteach.com
When Mount St. Helens erupted, it changed the shape of the mountain and the land around it. Copyright 2009 abcteach.com
Copyright 2009 abcteach.com Geologists are scientists who study rocks and Earth. A scientist who studies volcanoes is called a volcanologist. Volcanologists help people predict volcano eruptions. Copyright 2009 abcteach.com
Copyright 2009 abcteach.com Related Links KWL: Volcanoes Volcanoes: Reading Comprehension (primary/elem) Volcanoes: Reading Comprehension (elementary) Volcanoes Theme Unit materials and activities *** Microsoft Office may display a default warning about downloading materials. The above links are from abcteach.com and are safe. PERMISSON: This PowerPoint is for home, classroom, or school use only. It cannot be distributed, placed on a website, or duplicated for commercial use. For additional permission please contact support@abcteach.com. Copyright 2009 abcteach.com