PRE ASSESSMENT VOLCANOES

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 characteristic of magma mainly determines its explosiveness?

• color

• temparature

• silica content

• amount

It is a funnel-shaped opening at the top of a volcano.

• summit

• slope

• caldera

• crater

A thick layer of volcanic ash can be heavy enough to collapse the roofs of buildings because ash ________.

• is solid

• cannot be blown by winds

• becomes heavier as it cools

• consists of tiny fragments of rocks that become heavy when they pile up.

Lava with less silica content has high viscosity

• true

• false

• sometimes

Which of the following characteristics of a volcano depends on its magma emission?

• age

• size

• shape

• location

The energy generated by volcanoes.

Lava with a low amount of gas has high viscosity.

• true

• false

• maybe

• sometimes

Why are volcanoes located in the Pacific Ring of Fire?

• earthquake epicenters are also located there

• the presence of subductions zones

• magma is hotter in these areas

• all hotspots are located in the Ring of Fire

A -------------- volcano is one that isn’t currently active or erupting, but geologists think that it’s still capable of erupting.

• active

• dormant

• extinct

• inactive