Go to the Quizzes Page Volcanic Hazards 0% 98 Created by AbuBakrShalabi Please write your name and email to receive your certificate. 1 / 20 What is lava? Molten rocks inside a volcano Magma Molten rock outside a volcano Small rocks 2 / 20 Which classification system is used to rate hurricane severity? Richter scale Modified Mercalli scale Enhanced Fujita scale Saffir-Simpson scale 3 / 20 If a geologist detects many small earthquakes near an active volcano, what does this mean? The volcano is going to collapse The volcano is blocking plate movement The volcano may be about to erupt The volcano is no dormant 4 / 20 Scientists monitor volcano changes and use sensors to measure the concentration of volcanic gases such as sulfur dioxide to ......................... Know if the volcano becomes an extinct one Collect these gases and use them in laboratories Study the structure of Earth Predict if the volcano will erupt soon 5 / 20 What is one hazard that can be cause by a volcanic eruption? air pollution tornadoes blizzards weathering of rocks 6 / 20 A volcano that has erupted in the last 2000 years but not recently is known as........... Angry Active Extinct Dormant 7 / 20 How many volcanoes erupt each year, on average around 20 less than 5 more than 100 around 60 8 / 20 A volcanic eruption can alter the climate because.......... they heat the atmosphere dust and gas in the upper atmosphere reflect and absorb solar radiation geologists have determined it to be so they trigger tsunami 9 / 20 The following are signs that alert for a volcanic eruption EXCEPT ______________. Deformation Gas emissions Earthquakes Weather changes 10 / 20 How could predicting the future eruption of a volcano benefit people? Alert people to evacuate the area before the eruption Work to delay the eruption or eliminate it Know the exact time of the volcanic eruption Enable people to climb hills and watch the eruption 11 / 20 what are the 3 types of volcano? extinct volcano living volcano active volcano dormant volcano 12 / 20 Which of the following is NOT studied by geologists to predict volcanic eruptions? change in shape of the volcano earthquake swarms animal behavior ground deformation 13 / 20 Which type of volcano is formed in the middle of the tectonic plates? Hot spot volcano Dormant volcano Extinct volcano Active volcano 14 / 20 The Hawaiian Islands are examples of volcanoes that are associated with a _______. hot spot convergent plate boundary divergent plate boundary transform plate boundary 15 / 20 Why does magma tend to rise to the surface? It has large amounts of silica. It is less dense than the surrounding material. It is denser than the surrounding material. It contains very little silica. 16 / 20 What is the technology used to predict volcanic eruptions so that populations can be warned of a possible eruption? GPS Gas Sensors Doppler Radar Seismometer that detects earthquakes 17 / 20 This image shows the plate boundaries in bold black lines and the ring of fire in red. What is the relationship between the boundaries and the most common area of active volcanoes? Most volcanic zones on Earth are focused on the antarctic place Most volcanic zones on Earth are in areas of colder climates Most volcanic zones on Earth are near plate boundaries Most volcanic zones on Earth are near the southern part of the world 18 / 20 How are the hot spot volcanoes formed? Hot spots form when plumes of magma rise from Earth's mantle to Earth’s crust. Hot spots form at both convergent and divergent boundaries where the plates move. Hot spots form along divergent boundaries where the plates part away from each other. Hot spots form along convergent boundaries where the plates come closer to each other. 19 / 20 Which statement accurately describes a pyroclastic flow? Pyroclastic flows occur when the snow and ice of the summit are melted and mix with the ash and mud on the mountain. Pyroclastic flows move very quickly but are relatively cool. Pyroclastic flows move at speeds of more than 100 km/hr and have temperatures over 1,000°C. Pyroclastic flows move very slowly, and are rarely deadly. 20 / 20 A ____ often forms a mountain when layers of lava and volcanic ash erupt and build up. caldera dike volcano batholith Your score is 0% Restart quiz Go to the Quizzes Page