*Give one positive effect and one negative effect of volcanic eruptions.
Negative:
Destruction of man-made and natural environments.
Positive:
Volcanoes generate geothermal energy and nutrients which make the soil fertile.
*Aside from Mayon Volcano, name another Philippine volcano that has erupted recently.
Kanlaon Volcano
*What causes a shield volcano to be shaped like a broad dome?
Because the lava of the shield volcano is very fluid, very thin and has low viscosity. The lava spills like water and can spread out over a large area.
*By what process can a volcanic eruption affect temperatures around the world?
When eruption happens, it emits gases and particles.
The ashes and sulphur dioxide emitted have cooling effect because they have substances that reflect the sunlight away from the earth.
The CO2 generated cause warming by adding to the greenhouse effect.
*How is energy from volcanoes tapped as source of electricity?
By drilling the volcanoes and exploiting the heat from the molten rock.
