G11Q2W1.2 Describe how magma is formed (magmatism)
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- Q 1/10Score 0What is magma?29Solid rock on Earth’s surfaceWater mixed with lavaMolten rock below Earth’s surfaceSolidified lava flows
10 questions
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- Q1What is magma?Solid rock on Earth’s surfaceWater mixed with lavaMolten rock below Earth’s surfaceSolidified lava flows30s
- Q2Which factor increases with depth and can cause rock to melt?TemperatureWind speedOcean currentsPressure30s
- Q3Which are the main factors that cause rock to melt? I. Increase in temperature II. Decrease in pressure III. Addition of water or volatilesII and III onlyI, II, and IIII and III onlyI and II only30s
- Q4Which type of magma has the highest viscosity?Basaltic (Mafic)UltramaficAndesitic (Intermediate)Rhyolitic (Felsic)30s
- Q5Why does magma rise toward Earth’s surface after it forms?It is less dense than the surrounding rockIt is heavier than the crustIt is pushed up by earthquakesIt is pulled up by gravity30s
- Q6Which melting process happens at divergent plate boundaries?Magma crystallizationDecompression meltingConductive meltingFlux melting30s
- Q7At a subduction zone, which process is most responsible for magma formation?Cooling of magma in the mantleHeating by solar radiationaDecompression melting due to riftingFlux melting from water in the subducting slab30s
- Q8If the mantle’s water content suddenly increased, which type of melting would become more common?Flux meltingDecompression meltingRadiative meltingFrictional melting30s
- Q9A geologist finds magma with ~50% silica and a temperature around 1100°C. Which magma type is it?AndesiticBasalticRhyoliticUltramafic30s
- Q10Imagine a planet with no water and only convergent boundaries. Which factor would most limit magma formation?Lack of volatiles for flux meltingLack of silica in the crustLack of pressure differencesLack of heat in the mantle30s
