) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which describes a lava flow that travels downhill at over 100 mph? Choice Feedback A. Pelean That's not it. Pelean is a type of eruption. B. Shield That's not it. Shield is a type of volcano. *C. Pyroclastic flow That's correct! D. Tephra That's not it. Tephra is the name for flying debris. Global Incorrect Feedback The correct answer is: Pyroclastic flow. -------------------------------------------------------------------------------- Question 1b of 10 ( 1 Magma and Ejected Material 260732 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which describes the solid flying debris from a volcano? Choice Feedback A. Lava B. Magma *C. Tephra D. Pyroclastic flow Global Incorrect Feedback The correct answer is: Tephra. -------------------------------------------------------------------------------- Question 1c of 10 ( 1 Magma and Ejected Material 260733 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Magma that erupts onto the surface of the volcano is called _____. Choice Feedback A. viscosity B. pyroclastic flow *C. lava D. tephra Global Incorrect Feedback The correct answer is: lava. -------------------------------------------------------------------------------- Question 2a of 10 ( 3 Earthquakes 171056 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: Magnitude Question: Which measure of an earthquake is independent of distance from the focus? Attempt Incorrect Feedback 1st That's not it. There are two main measurements; one depends on distance and the other doesn't. Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: Magnitude. (Intensity depends on the distance from the focus, but magnitude does not.) -------------------------------------------------------------------------------- Question 2b of 10 ( 3 Earthquakes 260746 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: magnitude Question: The Richter scale measures the _____ of an earthquake. Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: magnitude. -------------------------------------------------------------------------------- Question 2c of 10 ( 3 Earthquakes 260747 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: Intensity Question: Which measure of an earthquake depends on how close you are to the focus? Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: Intensity. (Intensity depends on the distance from the focus, but magnitude does not.) -------------------------------------------------------------------------------- Question 3a of 10 ( 2 Volcanoes and Eruptions 171057 ) Maximum Attempts: 1 Question Type: Ordering Maximum Score: 5 Question: Put these eruption types in order from most destructive to least destructive. Correct Answer: 1. Plinian 2. Pelean 3. Strombolian 4. Hawaiian Attempt Incorrect Feedback 1st That's not it. Don't confuse Plinian with Pelean. Correct Feedback That's correct! Global Incorrect Feedback The correct order is: Plinian Pelean Strombolian Hawaiian The most destructive type of eruption is Plinian (like Mount Vesuvius). After that is Pelean, followed by Strombolian. The weakest is Hawaiian. -------------------------------------------------------------------------------- Question 3b of 10 ( 2 Volcanoes and Eruptions 260750 ) Maximum Attempts: 1 Question Type: Ordering Maximum Score: 5 Question: Put these eruption types in order from most destructive to least destructive. Correct Answer: 1. Plinian 2. Vulcanian 3. Strombolian 4. Fissure Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct order is: 1. Plinian 2. Vulcanian 3. Strombolian 4. Fissure The most destructive type of eruption is Plinian (like Mount Vesuvius). After that is Vulcanian, followed by Strombolian. The weakest is Fissure. -------------------------------------------------------------------------------- Question 3c of 10 ( 2 Volcanoes and Eruptions 260751 ) Maximum Attempts: 1 Question Type: Ordering Maximum Score: 5 Question: Put these eruption types in order from most destructive to least destructive. Correct Answer: 1. Plinian 2. Pelean 3. Vulcanian 4. Fissure Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct order is: 1. Plinian 2. Pelean 3. Vulcanian 4. Fissure The most destructive type of eruption is Plinian (like Mount Vesuvius). After that is Pelean, followed by Vulcanian. The weakest is Fissure. -------------------------------------------------------------------------------- Question 4a of 10 ( 1 Earthquakes 171055 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: Tsunami, Sunami, Tsunammi, Tsunnami Question: What is the term for a water wave that is created by an underwater earthquake? Attempt Incorrect Feedback 1st That's not it. Hint: One of these originated in the Indian Ocean and devastated the shores of Indonesia, Sri Lanka, South India, Thailand and other countries with waves up to 30 m (100 ft) in December 2004. Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: Tsunami. -------------------------------------------------------------------------------- Question 4b of 10 ( 1 Earthquakes 260748 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: tsunami, sunami, tsunammi, tsunnami Question: A large water wave called a _____ can be generated by underwater earthquakes. Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: tsunami. -------------------------------------------------------------------------------- Question 4c of 10 ( 1 Earthquakes 260749 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: Earthquake Question: What event happens underwater to cause a tsunami? Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: Earthquake. -------------------------------------------------------------------------------- Question 5a of 10 ( 2 Magma and Ejected Material 171052 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What conditions make for a violent volcanic eruption? Choice Feedback A. Magma with low silica content That's not it. Magma with low silica content has low viscosity, which leads to weak eruptions. B. Magma with low gas content That's not it. Magma with low gas content reduces pressure buildup. *C. Magma with high viscosity That's correct! D. Magma that can flow easily That's not it. Magma that flows easily has low viscosity so it can easily escape the volcano, reducing pressure build-up. Global Incorrect Feedback The correct answer is: Magma with high viscosity. -------------------------------------------------------------------------------- Question 5b of 10 ( 2 Magma and Ejected Material 260734 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What conditions make for a violent volcanic eruption? Choice Feedback A. Magma with low viscosity B. Magma with low gas content *C. Magma with high silica content D. Magma that can flow easily Global Incorrect Feedback The correct answer is: Magma with high silica content. -------------------------------------------------------------------------------- Question 5c of 10 ( 2 Magma and Ejected Material 260735 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What conditions make for a weak volcanic eruption? Choice Feedback A. Magma with high silica content B. Magma with high gas content *C. Magma with low viscosity D. Magma that cannot flow easily Global Incorrect Feedback The correct answer is: Magma with low viscosity. -------------------------------------------------------------------------------- Question 6a of 10 ( 2 Earthquakes 171053 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: The focus of an earthquake is: Choice Feedback A. on Earth's surface. That's not it. The focus is underground. B. the same as the epicenter. That's not it. The epicenter is on the ground, directly above the focus. C. directly above the epicenter. That's not it. The epicenter is on the ground, directly above the focus. *D. along the fault. That's correct! Global Incorrect Feedback The correct answer is: along the fault. -------------------------------------------------------------------------------- Question 6b of 10 ( 2 Earthquakes 260736 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: The focus of an earthquake is: Choice Feedback A. on Earth's surface. B. the same as the epicenter. C. directly above the epicenter. *D. below the epicenter. Global Incorrect Feedback The correct answer is: below the epicenter. -------------------------------------------------------------------------------- Question 6c of 10 ( 2 Earthquakes 260737 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: The epicenter of an earthquake is: Choice Feedback A. along a fault. B. the same as the focus. C. directly below the focus. *D. directly above the focus. Global Incorrect Feedback The correct answer is: directly above the focus. -------------------------------------------------------------------------------- Question 7a of 10 ( 2 Volcanoes and Eruptions 171054 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: The Hawaiian volcanoes are good examples of _____ volcanoes. Choice Feedback *A. shield That's correct! B. composite cone That's not it. Think of the type of volcano with low viscosity magma and frequent eruptions. C. cinder cone That's not it. Think of the type of volcano with low viscosity magma and frequent eruptions. D. lava dome That's not it. Lava domes form inside the craters of large volcanoes. Global Incorrect Feedback The correct answer is: shield. The Hawaiian volcanoes are good examples of shield volcanoes. -------------------------------------------------------------------------------- Question 7b of 10 ( 2 Volcanoes and Eruptions 260738 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which is a good example of a shield volcano? Choice Feedback *A. Mauna Loa B. Mount Saint Helens C. Mount Vesuvius D. Kilimanjaro Global Incorrect Feedback The correct answer is: Mauna Loa. The Hawaiian volcanoes, such as Mauna Loa, are good examples of shield volcanoes. -------------------------------------------------------------------------------- Question 7c of 10 ( 2 Volcanoes and Eruptions 260739 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which type of volcano is Mount Saint Helens? Choice Feedback *A. Composite cone B. Shield C. Cinder cone D. Lava dome Global Incorrect Feedback The correct answer is: Composite cone. Mount Saint Helens is a composite cone volcano. -------------------------------------------------------------------------------- Question 8a of 10 ( 2 Earthquakes 171049 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: After an earthquake, which type of seismic wave arrives first at a seismometer? Choice Feedback A. L waves That's not it. L waves are the slowest, so they arrive last. *B. P waves That's correct! C. S waves That's not it. S waves are not as fast as P waves. D. P and S waves That's not it. S waves are not as fast as P waves. Global Incorrect Feedback The correct answer is: P waves. -------------------------------------------------------------------------------- Question 8b of 10 ( 2 Earthquakes 260740 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: After an earthquake, which type of seismic wave arrives last at a seismometer? Choice Feedback A. P waves *B. L waves C. S waves D. P and S waves Global Incorrect Feedback The correct answer is: L waves. -------------------------------------------------------------------------------- Question 8c of 10 ( 2 Earthquakes 260741 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: After an earthquake, which type of seismic wave arrives second at a seismometer? Choice Feedback A. L waves *B. S waves C. P waves D. P and S waves Global Incorrect Feedback The correct answer is: S waves. -------------------------------------------------------------------------------- Question 9a of 10 ( 2 Volcanoes and Eruptions 171050 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which forms when a larger volcano collapses in on itself? Choice Feedback *A. Caldera That's correct! B. Tephra That's not it. Tephra is solid material ejected by a volcano. C. Tsunami That's not it. Tsunamis do not form due to volcanoes. D. Lava dome That's not it. Lava domes grow in the craters of large volcanoes. Global Incorrect Feedback The correct answer is: Caldera. -------------------------------------------------------------------------------- Question 9b of 10 ( 2 Volcanoes and Eruptions 260742 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which forms inside the crater of a large volcano? Choice Feedback *A. Lava dome B. Tephra C. Tsunami D. Caldera Global Incorrect Feedback The correct answer is: Lava dome. -------------------------------------------------------------------------------- Question 9c of 10 ( 2 Volcanoes and Eruptions 260743 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: A volcano that appears to be a large sunken depression is a _____. Choice Feedback *A. caldera B. tephra C. tsunami D. lava dome Global Incorrect Feedback The correct answer is: caldera. -------------------------------------------------------------------------------- Question 10a of 10 ( 2 Earthquakes 171051 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Most earthquakes happen: Choice Feedback A. in the middle of continents. That's not it. The middles of continents generally do not have plate movement, so they generally do not have earthquakes. *B. near subduction zones. That's correct! C. near passive margins. That's not it. Passive margins are margins that do not have subduction. D. in a ring around the Atlantic Ocean. That's not it. Most earthquakes happen in a ring around the Pacific Ocean. Global Incorrect Feedback The correct answer is: near subduction zones. -------------------------------------------------------------------------------- Question 10b of 10 ( 2 Earthquakes 260744 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Most earthquakes happen: Choice Feedback A. in the middle of continents. *B. near active margins. C. near regions with no subduction. D. in a ring around the Atlantic Ocean. Global Incorrect Feedback The correct answer is: near active margins. -------------------------------------------------------------------------------- Question 10c of 10 ( 2 Earthquakes 260745 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Earthquakes are most common: Choice Feedback A. in the middle of continents. *B. where oceanic crust slides under continental crust. C. where two continental plates spread apart. D. on the edges of the Atlantic plate. Global Incorrect Feedback The correct answer is: where oceanic crust slides under continental crust. --------------------------------------------------------------------------------