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