Chapter 6 Volcanoes Review Game
Rules Coin toss for 1 st question Team will answer the question, random selection Correct answer gets the team a point Wrong answer gives the other team a chance to steal- random choice Team with highest score gets 5 bonus points for the test
Define Volcano A weak spot in the crust where molten material comes to the surface
What is the ring of fire? A major volcanic belt that rims the Pacific ocean
Explain how volcanoes form at converging plate boundaries. Subduction forces crust into the mantle where it melts, rises, and breaks through the crust
Explain what a “hot spot” is. Magma melts through the crust like a blowtorch
Give an example of a hot spot volcano that formed on oceanic crust. Hawaii
Give an example of a hot spot volcano that formed on continental crust. Yellowstone
What is an island arc? A string of volcanic islands along an oceanic plate boundary
What process forms an island arc? When an oceanic plate subducts under another oceanic plate, melts, rises forming island volcanoes
Why does magma rise? Liquid magma is less dense than the surrounding rock and flows upwards into cracks
What is a magma chamber? As magma rises to the surface it forms a large underground pocket
What does a “pipe” in a volcano do? A crack in the crust where magma reaches the surface
What is a Volcano vent? A point on the surface where magma leaves a volcanic pipe
What is a lava flow? The river of lava that pours down a volcano
What is a crater? The bowl shaped area that forms around the main vent
What 2 factors effect how thick or fluid a volcano’s magma is? Temperature and silicon content
What is pahoehoe lava? Fast moving hot flowing lava
Describe aa lava Lava that is cooler and slower moving made up of jagged lava chunks
What determines if a volcanic eruption is quiet or explosive? The more silicon content in the magma, the more explosive
What is a pyroclastic flow? An explosive eruption hurling out ash, cinders, bombs, and gases
What are the 3 stages of a volcano? Active, dormant, and extinct
How is a hot spring or geyser a form of volcanic activity? A body of magma (geothermal energy) is heating the water of a hot spring or geyser
What are some of the ways geologists monitor volcanoes? Tiltmeters, laser ranging devices, local magnetic field, water levels in the crater, escaping gases, and temperature
Describe volcano hazards from a quiet eruption Lava flows from an eruption can burn everything in its path.
Describe volcano hazards from an explosive eruption Volcanic ash can bury entire towns, damage crops etc.
What are 3 of the types of landforms generated by lava? Shield volcanoes, cinder cone volcanoes, composite volcanoes, calderas, and lava plateaus
What are the 2 landforms left? Answered on the last slide
What is a volcanic neck, dike, & sill? Neck- magma hardens in a pipe Dike- Hardened magma that forced its way across layers of rock Sill- Magma squeezes between layers of rock
What is a batholith? A large magma body that cools within the crust
What is the largest mountain in the solar system? Olympus mons
How were the dark patches on the moon made? Ancient lava flows
Volcanoes on what 2 planets are similar to volcanoes on Earth? Venus & Mars
What are the volcanoes on Triton like? Eruptions of liquid nitrogen, not lava
What are the volcanoes on Io like? Sulfur volcanoes that erupt like fountains or umbrellas
What is a shield volcano? Lava flows gradually build a wide gently sloping mountain
What is a composite volcano? Lava flows alternating with eruptions of ash, cinders, and bombs form a tall cone shaped volcanoe
What is a cinder cone volcano? Ash, cinders, and bombs build up around the main vent in a steep cone shaped pile
What is a caldera volcano? The huge hole that is left from the collapse of a volcano’s main chamber
What is a lava plateau? Floods of lava build up in layers forming a plateau