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Gappa 8th Chp 4
Gappa Earth: Chapter 4
| Question | Answer |
|---|---|
| heat is transferred by movement of a heated fluid or gas | convection current |
| The supercontinent that began to break apart about 225 million years ago | Pangea |
| Wegner's hypothesis that the continents slowly move across Earth’s surface | continental drift |
| Process where molten material adds new oceanic crust into ocean floor | sea-floor spreading |
| Process where oceanic plate sinks back into the mantle and melts | subduction |
| The undersea mountain chain were new ocean floor is produced; a divergent plate boundary | mid-ocean ridge |
| Deep valley along the ocean floor through which the oceanic crust slowly sinks toward the mantle | deep ocean trench |
| A well-tested concept that explains a wide range of observation | scientific theory |
| During convection currents, where does the cooler, denser fluid travel | sinks downward |
| During convection currents, where does the hotter, less dense fluid travel | float upward |
| Part of the mantle that can flow like melted tar | asthenosphere |
| part of the core that is liquid metal | outer core |
| part of the core that is solid metal | inner core |
| edges of the plates | boundaries |
| distance plates can move in a year | 2 cm - 10 cm |
| the separate sections the earth's lithosphere is broken into | plates |
| as oceanic crust moves away from the mid-ocean ridge | becomes cooler and denser |
| magma rises from the mantle | is hot and least dense |
| features that form at a convergent boundary | deep ocean trench or mountains |
| features that form at a divergent boundary | mid ocean ridge or rift valley |
| features that occur at a transform boundary | earthquakes |
| crust is destroyed or deformed | convergent boundary |
| crust is created | divergent boundary |
| crust is neither created nor destroyed | transform boundary |
| the crust and very top part of the mantle | lithosphere |
| heat source for the convection current in the asthenosphere | mantle and core |
| the three scientists who contributed to the Theory of Plate Tectonics | Alfred Wegener, Harry Hess, J. Tuzo Wilson |
| two parts of the crust | oceanic crust and continental crust |
| Which pieces of evidence did Wegener use to support his theory of continental drift? | continent shape, fossils, climate evidence |
| What pieces of evident did Hess use to support his theory of sea floor spreading and subduction? | magma samples, drilling samples, and magnetic rock pattern on ocean floor |
Created by:
edeboo
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