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Plate Tectonics. The youngest material on the ocean floor is found where plates move apart. On which of the following structures is it usually found?

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Presentation on theme: "Plate Tectonics. The youngest material on the ocean floor is found where plates move apart. On which of the following structures is it usually found?"— Presentation transcript:

1 Plate Tectonics

2 The youngest material on the ocean floor is found where plates move apart. On which of the following structures is it usually found? A: plains B: mountains C: trenches D: ridges

3 Where does most volcanic and seismic (earthquake) activity occur? A: abyssal plains B: continental plains C: plate boundaries D: central area of plates

4 According to most geologists, approximately how many millions of years old is the oldest material on the ocean floor? A: 360 B: 180 C: 10 D: 450

5 Which of the following mountains are formed by the collision of the Indo-Australian plate and the Eurasian plate? A: Appalachians B: Rockies C: Alps D: Himalayas

6 Alfred Wegener first theorized that continents had been joined in a single supercontinent called A: Eurasia B: Pangaea C: Micronesia D: Babylon

7 Several kinds of events change the features (shape of continents, etc.) on Earth. Which of the following is NOT an example of an event that changes Earth's features: A: hurricanes B: earthquakes C: volcanoes D: comets

8 In 1980, Mt. St. Helens (a volcano in Washington state) erupted. Which of the following would have had the greatest long term affect of this eruption on the local ecosystem? A: local herds of deer relocated for several years until their food source was reinstated B: clouds of ash from the eruption limited sunlight for a few days C: geophysicists were in the area for two weeks of study before the eruption D: airplanes were diverted from the area above the volcano in the weeks before and after the eruption

9 When an oceanic plate collides and sinks below a continental plate, what type of feature may result? A: ocean trenches B: subduction zone C: mountains D: all of the above

10 Subduction of an oceanic plate causes which of the following? A: recycling of the crust rocks as they melt back into the magma layer B: magma to flow into local river systems C: destruction of coral reefs D: none of the above

11 In subduction zones, oceanic plates collide with and slide under continental plates. Why do oceanic plates slide under continental plates? A: continental plates are moving faster B: oceanic plates are moving faster C: oceanic plates are less dense than continental plates D: continental plates are less dense than oceanic plates

12 According to the model of plate tectonics, which layer is broken into plates? A: lithosphere B: asthenosphere C: hydrosphere D: core

13 New rock is being formed regularly as plates move away from each other under the ocean. A: True B: False

14 All rocks start out as molten magma. A: True B: False

15 Most earthquakes occur at convergence zones. A: True B: False

16 Mid-ocean ridges occur where plates are moving apart. A: True B: False


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