Q3 Science 9 Reviewer

Which characteristics of magma mainly determines its explosiveness?

• color

• amount

• temperature

• silica content

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

• Age

• size

• shape

• location

What type of volcanoes are formed from wide thin layers of lava?

• lava domes

• cinder cones

• Shield volcanoes

• Composite volcanoes

Mt. Akir-Akir, located in Province of North Cotabato, has no record of activity for the last 10,000 years. Which of the following statements is CORRECT?

• It is an active volcano.

• It is an inactive volcano.

• It is a potentially active volcano.

• It is a destructive volcano.

How will you classify volcanoes with no record of eruption?

• Active

• Inactive

• Extinct

• Dormant

Which of the following factors associated with huge volcanic eruptions may cause the decrease in the Earth's average temperature for a few years?

• heat

• light

• acid rain

• volcanic ash

What would magma with the highest viscosity contain?

• A high silica content and high temperature.

• A low silica content and high temperature.

• A high silica content and low temperature.

• A low silica content and low temperature.

Viscosity is a measure of a material's resistance to flow. Which of the following DOES NOT affect the viscosity of magma?

• Location of magma

• Temperature of the magma

• Chemical composition of the magma

• Presence of dissolved gases in the magma

The eruption of Mount Pinatubo in the Philippines on June 15, 1991, was the second largest of the 20th century. Its eruption was characterized as an excessively explosive type of eruption of gas and pyroclastic. Which type of the eruption is this?

• Phreatic

• Plinian

• Phreatomagmatic

• Strombolian.

Which of the following flow chart shows the correct sequence on how geothermal energy generates electricity for human use?