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Question 1: [23] The probe consists of an outer sphere of ________ about 1 m in diameter inside which is a cobalt-60 radioactive heat source.
MolybdenumTantalumTungstenChromium

Question 2: [17] Although the higher temperatures far exceed the ________ of the mantle rocks at the surface (about 1200 °C for representative peridotite), the mantle is almost exclusively solid.
Phase transitionBoiling pointLiquidMelting point

Question 3: Downward motion of material often occurs at ________ called subduction zones,[9] while upwelling of material can take the form of plumes.
Volcanic arcTransform faultConvergent boundaryOceanic trench

Question 4: [9][12] The uppermost mantle plus overlying crust are relatively rigid and form the ________, an irregular layer with a maximum thickness of perhaps 200 km.
Crust (geology)LithosphereEarthPlate tectonics

Question 5: The mantle is divided into sections based upon results from ________.
Seismic waveReflection seismologyEarthquakeSeismology

Question 6: The ________ of the Earth's mantle is a chaotic process (in the sense of fluid dynamics), which is thought to be an integral part of the motion of plates.
VorticityTemperatureWindConvection

Question 7: The mantle is a part of a ________ or other rocky body large enough to have differentiated by density.
Terrestrial planetGas giantSolar SystemExtrasolar planet

Question 8: The ________ at the bottom of the mantle is ~136 GPa (1.4 million atm).
TemperaturePressure measurementForcePressure

Question 9: Plate motion should not be confused with the older term ________ which applies purely to the movement of the crustal components of the continents.
Continental driftPangaeaPlate tectonicsAntarctica

Question 10: ________'s mantle is a rocky shell about 2,890 km (1,800 mi) thick that constitutes about 84 percent of Earth's volume.
NatureMoonSunEarth
















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