Volcanoes Jennifer Martin.

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Presentation transcript:

Volcanoes Jennifer Martin

Types of Volcanoes Shield: This volcano is formed from fluid basaltic magma. The explosions made by this volcano are generally less violent than those of other volcanoes. These volcanoes are generally also smaller and flatter than other volcanoes.

Types of Volcanoes Cinder Cone: These volcanoes are formed by basaltic and andesitic magma, and they are named cinder cones because they blow ash into the sky. Eruptions from these volcanoes tend to contain a lot of gas.

Types of Volcanoes Dome: This is a shorter, rounder volcano formed by viscous dacite magma. This volcano has smaller eruptions but more lava flow than the typical volcano.

Types of Volcanoes Stratovolcano: This volcano is the most dangerous kind, due to its huge size and height. Formed by andesite and dacite lava, this volcano tends to be extremely dangerous. Firestorms, mud flows and pyroclastic flows are all caused by this type of volcano.

Types of Volcanoes Caldera: This is a generally dry, extinct volcano formed near or in water.

Volcano Facts There are at least 1,500 active volcanoes on land in the world. It is impossible to calculate the number of underwater volcanoes. Indonesia has the most volcanoes of any country in the world. The biggest volcano in the world is Mauna Loa, in Hawaii. It rises off of the seafloor to 13,000 feet above sea level. The oldest volcano is Etna and that is about 350,000 years old. About 500 million people live close to active volcanoes!

Volcano Geography

Volcano Model http://www.volcanolive.com/model.html Ingredients small drink bottle 60 ml water 1 tablespoon baking soda 1/4 cup vinegar orange food colouring few drops of detergent small square of tissue.

Volcano Model con’td The chemical reaction Making the eruption Place the water, soap, food colouring and vinegar in the drink bottle. Wrap the baking soda in the tissue and drop into the bottle. The volcano model will then erupt. The chemical reaction NaHCO3 + CH3COOH → Na+ + H2O + CO2 + CH3COO-

Resources http://www.essortment.com/all/volcanofactsin_rmns.htm http://www2.scholastic.com/browse/article.jsp?id=4886 http://www.mapsofworld.com/major-volcanoes.htm