39. Tsunami can be generated by a hurricane. a. True b. False 40. If the seafloo

Question

39. Tsunami can be generated by a hurricane. a. True b. False 40. If the seafloor is suddenly displaced vertically, the ocean water will respond by: Subsiding Not moving at all a. c. Also rising up b. 41. Calling a tsunami a "tidal wave" is misleading because: a. A tsunami is not really a tide b. A tsunami is not really a wave c. A tsunami does not occur in the ocean d. A tsunami only occurs during ebb tides 42. The fault motion along the San Andreas fault on the sea floor can directly be the cause of a tsunami along the coast of California a. True b. False 43. Which is the most active tsunami area? a. North Atlantic ocean b. Indian ocean c. Caribbean sea d. Pacific ocean 44. Cinder cones are a result of? a. Hawaiian eruptions b. Strombolian eruptions c. Vulcanian eruptions d. Plinian eruptions 45. Mount St. Helens is considered to be an: c. Active Volcano a. Extinct Volcano b. Dormant Volcano

Explanation / Answer

39. True.

Tsunami and hurricane are a completely different phenomenon. Tsunami is caused by any disturbance above and below water and hurricanes are formed over the warm ocean waters during warm months. However, there is a slight possibility that hurricanes could cause tsunami by shifting ocean sediments that can trigger landslides inside oceans.

40. c. Also rising up.

This is usually the cause for the tsunami.

41. a. a tsunami is not really a tide.

Tsunami waves often have very long wavelengths, sometimes up to hundreds of kilometres. Therefore, they are unnoticed in the sea and mistaken for a tidal wave. Tsunami gains height only as it enters shallow waters and is maximum at shores.

42. a. True

However, it must be a big earthquake (usually exceeding the Richter magnitude of 7.5) to produce a destructive tsunami.

43. d. Pacific Ocean'

More than 80% of the world's tsunamis occur in the Pacific along its Ring of Fire subduction zones.

44. c. vulcanian eruptions

Cinder cones are built from particles and blobs of lava ejected from a single vent and hence are the simplest type of volcano. As the gas-charged lava is blown violently into the air, it breaks into small fragments that solidify and fall as cinders around the vent to form a circular or oval cone.

45. c. active volcano

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