INTRODUCTION TO VOLCANOES

What is a volcano?

• A large cloud that generates rain, hail and light.

• A land feature formed by folding of tectonic rocks.

• An opening in the Earth’s crust where magma erupts to the surface.

• A violent shaking of the Earth that occurs when tectonic plates slide past each other.

Where do most volcanoes occur?

• at tectonic plate boundaries

• in high, folded, mountain ranges

• in the middle-Atlantic ridge

• in the middle of the tectonic plates

In which region of the earth sites the 75% of world’s most active volcano?

• Gulf stream

• Himalayas mountain range

• Mid-Atlantic ridge

• Ring of fire

What is the correct term used to refer to the molten hot rock below the Earth’s surface?

• magma

• lava

• cinder

• igneous

What is the correct term used to refer to the molten hot rock flowing on the Earth’s surface?

• magma

• lava

• cinder

• igneous

Which of the following is an active volcano in the Philippines?

• Apo in Davao

• Bud Datu in Sulu

• Isarog in Camarines Sur

• Kanlaon in Negros Oriental

Which of the following is an inactive volcano?

• Mayon in Albay

• Taal in Batangas

• Vulcan in Camiguin

• Kanlaon in Negros Oriental

May erupt in the future but is not erupting at present or recently.

• Active Volcano

• Inactive Volcano

Have a record of eruption within the last 600 years or those that erupted 10, 000 years ago based on analyses of their materials.

• Active Volcano

• Inactive Volcano

Have not erupted for the last 10, 000 years and their physical form is being changed by agents of weathering and erosion through formation of deep and long gullies.

• Active Volcano

• Inactive Volcano