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Unit 1.5- Volcanoes.

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1 Unit 1.5- Volcanoes

2 Introduction to Volcanoes
Forces of Nature- National Geographic Video

3 Latitude and Longitude Review
Latitudes are imaginary lines to the north and south of the equator (x- axis) Longitudes are imaginary lines to the east and west of the Prime Meridian (y-axis) Example: Plot the following Points (1, 4), (2, 3), and (5, 2)



6 Earthquake Locations Where did most of the Volcanoes occur?
How is this similar to where earthquakes occur? How does plate tectonic movement effect the location of volcanoes?

7 Ring of Fire The volcanoes belt that circles the Pacific Ocean is called the Ring of Fire

8 Volcanoes at Subduction Zones
Volcanoes Form at Subduction Zones Video At CONVERGENT BOUNDARIES the denser plate subducts below the less dense plate to form a trench. As this dense plate gets pulled into the mantle, it begins to melt This melted rock rises toward the crust and forms a volcano

9 How do Volcanoes form in the middle of a plate?
Volcanoes that do not form on plate boundaries form over Hot Spots Hot Spots Video Hot magma from the core rises through the mantle and heats the earth’s crust until it breaks through the crust. As it breaks through the crust, lava is spewed into the ocean and hardens into an island. The oceanic crust moves like a conveyer belt and forms a string of islands like the Hawaiian islands.

10 Anatomy of a Volcano Can we go inside a volcano and see what it looks like? How could we learn what the inside of a volcano is like?

11 What does the inside of a volcano look like?
In your notes, draw and label a picture of what you think the inside of a volcano looks like.

12 Anatomy of a Volcano Vocabulary
Magma- Molten rock beneath the surface Lava- Molten rock on the surface Magma Chamber- as magma rises to the surface, it forms a large pocket beneath the surface that holds the magma Pipe: a narrow crack in the crust through which magma flows Vent- central opening that allows the flow of magma to the surface (where magma leaves the pipe) Crater- the bowl-like depression over the vent at the summit of the cone

13 Types of Volcanoes Cinder Cone Shield Composite

14 Cinder Cone Volcano A small, steep- sided volcano
Made mostly of cinders with lava flow intermixed Eruptions are small and often do not cause damage

15 Shield Volcano Usually wider than it is tall Made entirely of lava
Near oceans or on oceanic crust Eruptions are quiet, but lava causes significant damage

16 Composite Volcano A large, steep-sided volcano
Made of alternating layers of lava flow and pyroclastic debris Pyroclastic Debris: ash, lava and hot volcanic gas Erupt explosively or quietly

17 Life Cycle of Volcanoes
Active Volcanoes: a volcano that is erupting now, has erupted in the recent past, and shows signs of erupting in the near future Dormant Volcano: a volcano that has not erupted recently, but has during recorded history. It is expected to erupt again in the future. Extinct Volcano: has not erupted in recorded history and will not likely erupt again.

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