Question 1

What is the difference between magma and lava in a volcano?

Accepted Answer

Magma is hot, liquid molten rock located deep inside the magma chamber below the Earth's surface.

Once this liquid rock erupts through the volcano's crater and flows out onto the surface, it is called lava.

Question 2

How does a volcanic magma chamber work under the Earth?

Accepted Answer

A magma chamber is a large underground reservoir where hot liquid rock pools under high pressure.

Tectonic plate movements squeeze this chamber, pushing the magma upward through the main conduit vent during an eruption.

Question 3

What is the role of tectonic plates in creating volcanoes?

Accepted Answer

Earth's crust is divided into massive tectonic plates that drift slowly.

When they collide or pull apart, gaps open up, allowing super-heated magma to escape from the mantle and build volcanoes.

Question 4

What materials are released during an explosive volcanic eruption?

Accepted Answer

Explosive eruptions blast out hot lava flows, billing ash clouds of rock powder, and toxic sulphur gas.

They also launch pyroclastic debris, including heavy volcanic bombs that spin through the air.

Question 5

How do volcanic sills differ from vertical magma vents?

Accepted Answer

A vertical conduit channels magma straight up to the crater.

In contrast, a sill is a horizontal sheet of magma that squeezes sideways between layers of older crustal rock and cools down.

Question 6

How does a volcanic pumice rock float on water?

Accepted Answer

Pumice is a light, porous volcanic rock formed when hot lava cools very rapidly.

It is filled with thousands of tiny gas bubbles trapped inside, which makes its density lower than water so it floats.

Question 7

What are the main geological layers inside the Earth?

Accepted Answer

The Earth has four layers: the thin rocky crust, the semi-molten mantle, the liquid outer core, and the solid inner core.

The heat from these deeper layers drives all volcanic activity on the surface.

Question 8

What safety precautions should people take near active volcanoes?

Accepted Answer

People must stay far away from evacuation zones to avoid hot lava flows, breathing harmful sulphur gas, or getting hit by pyroclastic debris.

Wearing masks can protect lungs from volcanic ash clouds.

Volcano Structure

Geology & Earth Layers