Volcanoes and Volcanic Activity
Physics ⇒ Earth and Space Physics
Volcanoes and Volcanic Activity starts at 7 and continues till grade 12.
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A volcanic eruption releases 2.0 × 1010 J of thermal energy. If this energy is used to heat 1.0 × 108 kg of water from 20°C to 100°C (specific heat capacity of water = 4,200 J/kg·K), is the energy sufficient to bring all the water to boiling point?
A volcano erupts and releases 1.5 × 1012 kg of ash into the atmosphere. If the average density of the ash is 900 kg/m3, calculate the approximate volume of ash released.
Describe how volcanic eruptions can lead to the formation of fertile soils.
Describe the process of magma formation at subduction zones.
Describe the relationship between the silica content of magma and its viscosity.
Describe two methods used to monitor volcanic activity.
Explain how the presence of water in subducting oceanic plates influences magma formation.
Explain the difference between an active, dormant, and extinct volcano.
Explain why shield volcanoes have gentle slopes compared to stratovolcanoes.
Explain why volcanic eruptions are often preceded by earthquakes.
Name the three main types of plate boundaries where volcanic activity occurs.
State one major difference between magma and lava.
