Partial tides _______. a. represent various components of local tides that are resolved mathematically b. are predicted individually c. are added together to predict the height and timing of astronomical tides d. All of the above are correct. e. Only a and c are correct. 31. Internal waves form _______. a. at the interface between layers […]
Tsunamis are _______. a. tidal waves b. deep-water waves because they travel so fast over deep water c. shallow-water waves because their wavelengths are far greater than the ocean is deep d. generated only by submarine earthquakes 33. The majority of tsunamis are triggered by tectonic events in _______. a. the Atlantic mid-ocean ridge system b. the […]
When they reach a shoaling coast or island, tsunamis _______. a. make the transition from deep-water waves to shallow-water waves b. slow, shorten, and build c. are often first noticed on a beach as an abnormal retreat of water off the beach d. All of the above are correct. e. Both b and c are […]
Link to WGBH Boston Nova Killer Volcanoes (Links to an external site.) High-silica rhyolite contains 75 to 80 percent silica. Rhyolitic volcanoes tend to erupt magma explosively commonly also producing abundant ash and pumice which can rise into the lower stratosphere affecting weather systems far from the volcano source. The last such event was the 1991Mount Pinatubo eruption which produced a very […]
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