PPT-Volcanoes Nat Geo

Volcanic Eruptions pages 209216 Magma Reaches Earths Surface pages 210211 Students will be able to Explain what happens when a volcano erupts Describe the two types of volcanic eruptions. Frequency and Quantity. There are ~ 550 historically active volcanoes. About 60 erupt annually. The majority are 1) at the edge of continents and 2) underwater. Dormant volcanic cone in Japan. What causes volcanoes?. Gwen . Nytes. Composition. The magma in this type of volcano is made of basaltic-andesitic materials. The magma has an intermediate viscosity, so . it’s mildly explosive. It also consists of a lot of gases, so when the lava cools and hardens in the air, gas bubbles get trapped inside. The particles fall back down as cinders, and pile around the vent.. GO. What do you know already about volcanoes?. Let’s learn more. Click on the links below.. What is a volcano?. What is magma and what is lava?. What types of volcano are there?. What causes a volcano to erupt?. The Earths crust . The earths crust is in constant motion.. Volcanoes and earthquakes arise as sections of crust push . toghether. or pulled apart. Volcanoes and earthquakes are more common in certain parts of the world. By monitoring ground vibrations scientists can sometimes. . T. his . is a map of Pompeii's famous volcano called . Mount . Vesuvius. . How many volcanoes are there in the . world?. There are around 1510 'active' volcanoes in the world. We currently know of 80 or more which are under the oceans. . VOLCANOES.. What is a volcano?. A volcano is a mountain that opens . below . to a pool of molten rock . called a magma chamber below . the surface of the earth. When . the pressure . builds up, eruptions take place. . Volcanism is mostly focused at plate margins. Pacific Ring of Fire. This map shows the margins of the Pacific tectonic plate and surrounding region. The red dots show the location of active volcanism. Notice how the majority of the volcanism is focused in lines along the plate boundaries? For this region is the area known as the “Pacific Ring of Fire”.. 9.1 – How & Where do Volcanoes Form?. One of the most dramatic activities associated with plate tectonics is the eruption of a volcano.. Volcano refers to both:. The . opening. in Earth’s crust through which molten rock, gases, and ash erupt.. Where are the major zones of volcanism?. What are the parts of a volcano?. How do volcanic landforms differ?. Copyright © McGraw-Hill Education. Volcanoes. Review. convergent. New. volcanism. hot spot. Compare the features of volcanoes.. Describe the stages in volcano formation.. What are Volcanoes?. Volcanoes are vents through which molten rock and gas escape from a . magma chamber.. Volcanoes can differ. Volcanoes. Volcano:. mountain that forms in Earth’s crust when molten material (magma) reaches the surface. . Remember, . magma . is molten rock below ground; . lava. is molten rock at the surface. . What are volcanoes?. Does anyone know what a volcano is?. A volcano . is a landform (usually a mountain) where . liquid rock . erupts through the surface of the planet. .. The name "volcano" has its origin from the name of Vulcan, a god of fire in Roman mythology.. . . Cause. most volcanoes are formed when two of Earth’s plate collide. the collision drives one of the plates under another . the plate that is under the other one begins to melt-->this melted rock is known as magma. About 1500. Bellringer. Begin volcano video and questions. Objective. Pick one way to trigger a tsunami (1). Include one real life example (1). Describe how a tsunami wave is different from a wind wave (2).