Go to the Quizzes Page Volcanic Hazards 0% 98 Created by AbuBakrShalabi Please write your name and email to receive your certificate. 1 / 20 Why does magma tend to rise to the surface? It is denser than the surrounding material. It contains very little silica. It has large amounts of silica. It is less dense than the surrounding material. 2 / 20 What is the technology used to predict volcanic eruptions so that populations can be warned of a possible eruption? Gas Sensors Doppler Radar Seismometer that detects earthquakes GPS 3 / 20 A ____ often forms a mountain when layers of lava and volcanic ash erupt and build up. volcano dike batholith caldera 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 Predict if the volcano will erupt soon Study the structure of Earth Collect these gases and use them in laboratories 5 / 20 The Hawaiian Islands are examples of volcanoes that are associated with a _______. divergent plate boundary hot spot transform plate boundary convergent plate boundary 6 / 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 7 / 20 If a geologist detects many small earthquakes near an active volcano, what does this mean? The volcano is no dormant The volcano may be about to erupt The volcano is blocking plate movement The volcano is going to collapse 8 / 20 How many volcanoes erupt each year, on average more than 100 less than 5 around 20 around 60 9 / 20 Which classification system is used to rate hurricane severity? Modified Mercalli scale Enhanced Fujita scale Saffir-Simpson scale Richter scale 10 / 20 what are the 3 types of volcano? extinct volcano living volcano active volcano dormant volcano 11 / 20 What is one hazard that can be cause by a volcanic eruption? blizzards tornadoes air pollution weathering of rocks 12 / 20 The following are signs that alert for a volcanic eruption EXCEPT ______________. Gas emissions Weather changes Earthquakes Deformation 13 / 20 What is lava? Molten rocks inside a volcano Magma Small rocks Molten rock outside a volcano 14 / 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 convergent boundaries where the plates come closer to each other. Hot spots form along divergent boundaries where the plates part away from each other. 15 / 20 Which of the following is NOT studied by geologists to predict volcanic eruptions? earthquake swarms animal behavior change in shape of the volcano ground deformation 16 / 20 How could predicting the future eruption of a volcano benefit people? Enable people to climb hills and watch the eruption Work to delay the eruption or eliminate it Alert people to evacuate the area before the eruption Know the exact time of the volcanic eruption 17 / 20 A volcano that has erupted in the last 2000 years but not recently is known as........... Dormant Extinct Active Angry 18 / 20 Which type of volcano is formed in the middle of the tectonic plates? Hot spot volcano Active volcano Extinct volcano Dormant volcano 19 / 20 Which statement accurately describes a pyroclastic flow? 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. Pyroclastic flows occur when the snow and ice of the summit are melted and mix with the ash and mud on the mountain. 20 / 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 Your score is 0% Restart quiz Go to the Quizzes Page