7. Which is the correct equation for the force of gravity? A. force = mass x g B
ID: 116445 • Letter: 7
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7. Which is the correct equation for the force of gravity? A. force = mass x g B. mass-force #215; g C. force = mass #247; g D. mass-g #215; g 8. Plate movement rates range between per year A. .1 and 10 centimeters B. 1 and 10 meters C. 1 and 10 kilometers D. 1,000 and 11,000 kilometers 9. Which is the process by which plates separate and oceanic crust is created? A. sea-floor spreading B. polar wandering C. continental drift D. suturing 10. Which was one of the basic premises of Wegener's theory of continental drift? A. The continents are attached B. The shapes of the continents are permanent. C. The continents have always existed as separate entities D. Earth once had nine continents 11. Which is due to old oceanic lithosphere sinking into the mantle at subduction zones? A. ridge push B. slab suction C. ridge sink D. slab pull 12. Plate tectonics are driven by what force? A. Earth losing internal heat B. earthquakes and volcanoes C. the interaction of oceanic ridges and Earth's crust D. heat and radiation from the SunExplanation / Answer
8) .1 and 10 centimetres
Scientists have observed that the plates move at rates ranging from 1 cm to 12 cm per year
9) A. seafloor spreading
Seafloor spreading happens at the bottom of an ocean as tectonic plates move apart. The seafloor moves and carries continents with it. At ridges in the middle of oceans, new oceanic crust is created. The motivating force for seafloor spreading ridges is tectonic plate pull rather than magma pressure, although there is typically significant magma activity at spreading ridges
10) A. The continents are attached
Wegener thought all the continents were once joined together in an "Urkontinent" before breaking up and drifting to their current positions.
11) slab suction
Slab suction forces are one of the major plate tectonic driving forces. Slab suction occurs when a subducting slab drives flow in the nearby mantle. This flow then exerts shear tractions on nearby plates. This driving force is important when the slabs are not strongly attached to the rest of their respective tectonic plate. They cause both the subducting and overriding plate to move in the direction of the subduction zone. Slab suction is the weakest of the three major forces involved in plate motion, the others being slab pull, the strongest, and ridge push.
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