Chapter 4 Lesson 2 Earthquakes And Volcanoes Earthquakes
- Slides: 25
Chapter 4 Lesson 2 Earthquakes And Volcanoes
Earthquakes o Earthquake – sudden movement of Earth’s crust o The actual place underground where the rocks break producing vibrations is called the focus o The place on the surface directly above the focus is called the epicenter
http: //www. geo. uib. no/jordskjelv/index. php? topic=earthquakes&lang=en
http: //www. geo. uib. no/jordskjelv/index. php? topic=earthquakes&lang=en
http: //www. geo. uib. no/jordskjelv/index. php? topic=earthquakes&lang=en
San Andreas Fault
Seismic Waves Originate at the focus and travel outward in all directions Magnitude – the measure of the amount of energy released by an earthquake ü Aftershocks: Aftershocks Are adjustments in the crust after in earthquake
Volcano – opening in the Earth’s crust • Eruption – outpouring of melted rock, ash, and gases • Lava – magma that reaches the Earth’s surface • Crater – a • depression around a vent
Ring of Fire The ring around the Pacific Ocean that has most of the world’s volcanoes
Volcanoes Quiet lava flows
• Dike – magma that hardens in a vertical crack • Sill – magma that hardens between horizontal layers of earth • Laccolith – magma in a sill that pushes upward • Batholith – large, underground magma formation
Types of Volcanoes • Shield Volcano a) Built from layers of lava b) Non-explosive eruptions c) Not very steep, but can be big
Types of Volcanoes • Cinder Cone Volcano a) Built from pyroclastic material b) Moderately explosive, short eruptions c) Small in size, steep slopes
Types of Volcanoes • Composite Volcanoes a) Most common type b) Explosive eruptions and lava flow c) Built from pyroclastic material AND lava
Mt. St. Helen before the explosive eruption
Volcanoes
Mt. St. Helen after the eruption
• Island chain – line of volcanic mountains • Hot spot – stationary pool of magma • Island arc – volcanic islands that are made my subducting ocean floor plates
Mid-Plate Hotspots
- Chapter 8 earthquakes and volcanoes
- Chapter 8 section 1 what are earthquakes
- Chapter 8 earthquakes and earth's interior
- Chapter 8 earthquakes and earth's interior
- Interesting facts about mt mayon
- Are canyons constructive or destructive
- Chapter 19 earthquakes
- Chapter 19 earthquakes
- Volcano diagram for kids
- How are volcanoes classified?
- Paboeboe
- Ecuador
- Extreme earth
- What do you already know about volcanoes
- Guyots
- Volcanoes nature's incredible fireworks
- Types of volcanoes
- How are volcanoes formed
- Most volcanoes occur __________. *
- Active volcanoes map
- How do volcanoes change landforms?
- Big island size broad slightly domed
- Volcanoes knowledge organiser
- What does the elastic rebound theory explains?
- Types of volcanoes
- Ring of fire volcanoes