Volcanic Hazards and Benefits Quiz with Answers for Grade 7

📚 Quick Study Guide

• 🌋 Volcanic hazards include: lava flows, ashfall, pyroclastic flows, lahars (mudflows), and volcanic gases.
• 🔥 Lava flows are streams of molten rock that erupt from a volcano. They can destroy everything in their path.
• 💨 Ashfall consists of tiny fragments of rock and glass that are ejected into the atmosphere during a volcanic eruption. Ashfall can disrupt air travel, damage crops, and cause respiratory problems.
• 💥 Pyroclastic flows are fast-moving currents of hot gas and volcanic debris. They are extremely dangerous and can destroy everything in their path.
• 🌊 Lahars are mudflows composed of volcanic ash, rock, and water. They can travel long distances and bury everything in their path.
• 🌱 Volcanic benefits include: fertile soils (from weathered volcanic rock), geothermal energy, and the creation of new land.
• 🌍 Volcanoes form at plate boundaries (where tectonic plates collide or separate) and at hotspots (where plumes of hot mantle material rise to the surface).

🧪 Practice Quiz

1. Which of the following is NOT a volcanic hazard?
   1. Lava flow
   2. Ashfall
   3. Earthquake
   4. Pyroclastic flow
2. What is a lahar?
   1. A type of lava
   2. A mudflow composed of volcanic ash, rock, and water
   3. A volcanic gas
   4. A type of volcano
3. Which volcanic hazard is a fast-moving current of hot gas and volcanic debris?
   1. Lava flow
   2. Ashfall
   3. Pyroclastic flow
   4. Lahar
4. What is one benefit of volcanoes?
   1. They cause earthquakes
   2. They create infertile soils
   3. They provide geothermal energy
   4. They destroy all life
5. Where do volcanoes commonly form?
   1. Only in deserts
   2. At plate boundaries and hotspots
   3. Only in the ocean
   4. Only on mountains
6. Which of the following is made of tiny fragments of rock and glass?
   1. Lava
   2. Ashfall
   3. Mud
   4. Water
7. How do volcanoes help create fertile soils?
   1. Volcanic rock weathers and breaks down
   2. Volcanoes attract rainfall
   3. Volcanoes kill all plant life allowing for new growth
   4. Volcanoes prevent erosion