PISA-Types-of-Volcanoes pisa type questions.pptx

pisa type questions in science 9

1. PISA Types of Volcanoes

2. Sophia recently watched a documentary about Mount Pinatubo, one of the most significant volcanic eruptions of the 20th century. She learned that volcanic eruptions occur when pressure builds up beneath the Earth’s surface, forcing magma, gases, and ash to escape through a volcano’s vent. Some eruptions are explosive, sending huge columns of ash and gas high into the atmosphere, while others are less violent, with lava flowing steadily down the slopes.

3. The type of eruption depends on factors like the magma's viscosity, gas content, and the pressure underground. Sophia was fascinated by how eruptions can dramatically shape the landscape, create fertile soil, and even impact the global climate by releasing particles into the atmosphere. However, she also realized the destructive power of volcanic eruptions, as they can bury towns, disrupt flights, and cause health problems from ashfall. Sophia wonders how scientists predict eruptions and how the characteristics of magma influence the eruption’s behavior.

4. What determines whether a volcanic eruption will be explosive or gentle, and how does this affect the materials released during the eruption? A) The volcano's size determines the eruption’s intensity, with larger volcanoes releasing more ash and lava. B) The magma's viscosity and gas content determine the eruption type, with thicker magma and more gas causing explosive eruptions. C) The location of the volcano determines the eruption type, with underwater volcanoes being more explosive. D) The depth of the magma chamber determines the eruption, with deeper magma causing more gentle eruptions.

5. END