Go to the Quizzes Page Volcanic Hazards 0% 158 Created by AbuBakrShalabi Please write your name and email to receive your certificate. 1 / 20 Which statement accurately describes a pyroclastic flow? Pyroclastic flows move very slowly, and are rarely deadly. 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 occur when the snow and ice of the summit are melted and mix with the ash and mud on the mountain. 2 / 20 A ____ often forms a mountain when layers of lava and volcanic ash erupt and build up. volcano batholith dike caldera 3 / 20 what are the 3 types of volcano? active volcano living volcano dormant volcano extinct volcano 4 / 20 What is the technology used to predict volcanic eruptions so that populations can be warned of a possible eruption? Seismometer that detects earthquakes Gas Sensors GPS Doppler Radar 5 / 20 A volcano that has erupted in the last 2000 years but not recently is known as........... Extinct Angry Active Dormant 6 / 20 Why does magma tend to rise to the surface? It contains very little silica. It is denser than the surrounding material. It is less dense than the surrounding material. It has large amounts of silica. 7 / 20 A volcanic eruption can alter the climate because.......... they trigger tsunami they heat the atmosphere dust and gas in the upper atmosphere reflect and absorb solar radiation geologists have determined it to be so 8 / 20 How are the hot spot volcanoes formed? 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. Hot spots form when plumes of magma rise from Earth's mantle to Earth’s crust. 9 / 20 How could predicting the future eruption of a volcano benefit people? Know the exact time of the volcanic eruption Alert people to evacuate the area before the eruption Enable people to climb hills and watch the eruption Work to delay the eruption or eliminate it 10 / 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 near plate boundaries Most volcanic zones on Earth are near the southern part of the world Most volcanic zones on Earth are in areas of colder climates 11 / 20 Which type of volcano is formed in the middle of the tectonic plates? Extinct volcano Dormant volcano Active volcano Hot spot volcano 12 / 20 Which classification system is used to rate hurricane severity? Richter scale Saffir-Simpson scale Modified Mercalli scale Enhanced Fujita scale 13 / 20 What is lava? Molten rock outside a volcano Molten rocks inside a volcano Small rocks Magma 14 / 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 15 / 20 How many volcanoes erupt each year, on average around 20 less than 5 more than 100 around 60 16 / 20 Which of the following is NOT studied by geologists to predict volcanic eruptions? earthquake swarms ground deformation animal behavior change in shape of the volcano 17 / 20 The Hawaiian Islands are examples of volcanoes that are associated with a _______. convergent plate boundary divergent plate boundary transform plate boundary hot spot 18 / 20 The following are signs that alert for a volcanic eruption EXCEPT ______________. Earthquakes Deformation Weather changes Gas emissions 19 / 20 What is one hazard that can be cause by a volcanic eruption? blizzards tornadoes weathering of rocks air pollution 20 / 20 If a geologist detects many small earthquakes near an active volcano, what does this mean? The volcano is blocking plate movement The volcano is no dormant The volcano may be about to erupt The volcano is going to collapse Your score is 0% Restart quiz Go to the Quizzes Page