Understanding Volcanism

What is the primary cause of volcanic eruptions?

• The presence of water in the atmosphere.

• The cooling of lava in the ocean.

• The alignment of tectonic plates.

• The movement of magma due to pressure buildup.

Which type of volcano is characterized by a broad, gently sloping profile?

• Lava dome

• Shield volcano

• Cinder cone

• Stratovolcano

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

• igneous rock

• magma

• lava

• volcanic ash

Which gas is most commonly released during a volcanic eruption?

• Carbon dioxide

• Sulfur dioxide

• Water vapor

• Methane

What is the name of the volcanic material that is ejected during an eruption?

• tephra

• ash cloud

• magma

• lava

Which type of volcanic eruption is known for its explosive nature?

• Shield volcano eruption

• Lava dome eruption

• Stratovolcano eruption

• Fissure eruption

What is the term for a large volcanic crater formed by a major eruption?

• crater lake

• volcanic dome

• caldera

• ash cloud

Which layer of the Earth is primarily involved in volcanic activity?

• Crust

• Core

• Mantle

• Atmosphere

What is the difference between a shield volcano and a stratovolcano?

• Shield volcanoes have gentle slopes and are built from low-viscosity lava, while stratovolcanoes have steep slopes and are formed from layers of lava and ash.

• Shield volcanoes are smaller than stratovolcanoes and erupt more frequently than them.

• Stratovolcanoes have gentle slopes and are primarily made of basaltic lava, while shield volcanoes are steep and made of andesitic lava.

• Shield volcanoes are formed from explosive eruptions, while stratovolcanoes are built from fluid lava flows.

Which famous volcano erupted in 79 AD, burying the city of Pompeii?

• Kilauea

• Mauna Loa

• Mount Etna

• Mount Vesuvius