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VOLCANOES By: Joseph Faletto. TYPES There are different types of volcanoes. Some are big and some are small. Some are different shapes. But a volcanologist.

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Presentation on theme: "VOLCANOES By: Joseph Faletto. TYPES There are different types of volcanoes. Some are big and some are small. Some are different shapes. But a volcanologist."— Presentation transcript:

1 VOLCANOES By: Joseph Faletto

2 TYPES There are different types of volcanoes. Some are big and some are small. Some are different shapes. But a volcanologist describes a volcano in three ways: a shield volcano, a composite volcano, and a cinder cone volcano. If you do not know about these volcanoes, then this is the right book for you. 1

3 SHIELD VOLCANOES A shield volcano is shaped like a broad, flat dome. It is the biggest of the three volcanoes. Its lava is low in silica which flows easily. This is why this type of volcano is known to be dangerous. The shield volcano is made up of layers of lava from previous eruptions. This is why it is the biggest of the three volcanoes. 2

4 COMPOSITE VOLCANOES This volcano is called a composite volcano. A composite volcano is cone-shaped and is built of layers of hardened lava and rock fragments. A composite volcano is steep near the top and flattens out at the bottom. Because hardened lava flows add strength to the structure of a composite volcano, it can grow much larger than a cinder cone volcano. 3

5 CINDER –CONE VOLCANOES This volcano is called a cinder- cone volcano. This volcano has steep sides and is a loose pile of volcanic rock fragments. Cinders form as gas-rich magma erupts. One reason that these volcanoes are dangerous is that when large chunks of lava are thrown in the air they are hardened before they hit the ground. 4

6 Vocabulary Volcanologist- somebody that studies volcanoes.(1) Broad- wide; long.(2) Silica- a pasty substance, similar to glue.(2) Structure-anything composed of parts arranged together in some way; an organization

7 Thanks to: To my teacher Mrs. Garrett. soft.comwww.office/micro soft.com


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