Volcanic Activity and Eruptions

The video explains the nature of volcanoes, highlighting that there are about 1,500 on Earth. It describes how tectonic plate movements lead to volcanic activity, with magma forming deep within the Earth and rising to the surface as lava. The type of eruption depends on the magma's properties, with thin magma leading to gentle flows and thick magma causing explosive eruptions. The video also discusses the Ring of Fire, a hotspot for volcanic activity, and how scientists monitor volcanoes to predict eruptions and alert the public.

Approximately how many volcanoes are there on Earth?

• 1,500

• 1,000

• 2,500

• 2,000

Where does most volcanic activity occur?

• In the middle of tectonic plates

• Where tectonic plates collide

• In the ocean

• In deserts

What causes rocks to melt and form magma deep within the Earth?

• High pressure

• Low pressure

• High temperature

• Low temperature

What is magma called once it reaches the Earth's surface?

• Basalt

• Ash

• Lava

• Pumice

What type of magma leads to a non-explosive eruption?

• Thick and sticky

• Thin and runny

• Hot and viscous

• Cold and solid

Which volcano is known for its non-explosive eruptions?

• Mount Etna

• Mount Saint Helens

• Hawaii's volcanoes

• Krakatoa

What happens when gas gets trapped in thick magma?

• It forms a new crust

• It cools down

• It causes an explosive eruption

• It causes a non-explosive eruption

Which of the following volcanoes is known for explosive eruptions?

• Mount Fuji

• Hawaii's volcanoes

• Mauna Loa

• Mount Etna

What is the 'Ring of Fire' known for?

• Having no volcanic activity

• Having many subduction zones

• Being a peaceful area

• Being a desert

Why is monitoring volcanic activity important?

• To predict earthquakes

• To alert the public before an eruption

• To measure sea levels

• To study wildlife