Volcanoes: Understanding Eruptions and Their Causes

What is the term used for molten rock found beneath the Earth's surface?

• Lava

• Basalt

• Magma

• Obsidian

What causes the magma to rise and eventually lead to a volcanic eruption?

• Ocean tides

• The Earth's magnetic field

• Pressure from the Earth's crust

• Wind currents

Where are most volcanoes typically found?

• In the middle of tectonic plates

• In desert regions

• Under the ocean

• On plate boundaries

What are 'hot spots' in geological terms?

• Areas with frequent earthquakes

• Places with abundant mineral deposits

• Locations with high heat concentration in the Earth's mantle

• Regions with high volcanic activity

Approximately how many active volcanoes are there worldwide today?

• 1000

• 500

• 2000

• 1500