What is common of volcanoes that have the most violent eruptions?

A. They feature magma with very high silica content.

B. They are shield volcanoes.

C. They feature magma with low viscosity.

D. They have no magma, but have much lava.

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3