Volcanoes: How They Erupt!

Exploring Earth's Fiery Mountains Year 5 Science Understanding Volcanic Processes

What Do You Think?

What causes a volcano to erupt? Where do you think volcanoes are found? Have you ever seen pictures or videos of volcanic eruptions?

What is a Volcano?

A volcano is an opening in Earth's surface It allows hot rock, gas, and ash to escape from underground Volcanoes are like Earth's pressure release valves They can be active, dormant, or extinct

Inside Planet Earth

Earth has different layers like an onion The center (core) is extremely hot - over 5000°C! Hot melted rock called magma forms deep underground This magma wants to rise toward the surface

Magma vs Lava - What's the Difference?

{"left":"Magma is melted rock underground\nIt's extremely hot - around 1000°C\nContains gases and steam\nMagma is what we call it BEFORE it erupts","right":"Lava is melted rock above ground\nIt's the magma that has erupted from the volcano\nStill very hot but cooling down\nLava is what we call it AFTER it erupts"}

How Volcanoes Erupt - Step by Step

Why Do Volcanoes Erupt?

Pressure builds up underground as magma rises Gases in the magma expand like bubbles in fizzy drink The magma pushes upward looking for a way out When pressure gets too high - BOOM! - eruption happens

Types of Volcanic Eruptions

Gentle eruptions - lava flows slowly like thick honey Explosive eruptions - violent blasts with ash clouds Some volcanoes bubble and ooze continuously Others sleep for years then suddenly wake up!

Volcano Experiment Time!

Let's make our own volcano! Mix baking soda, vinegar, and red food coloring Watch the 'eruption' happen What do you notice about how it flows?

What We've Learned

Volcanoes are openings in Earth's surface Hot magma underground becomes lava when it erupts Pressure buildup causes eruptions There are different types of volcanic eruptions Volcanoes help us understand how our planet works!