Summative Test in Earth and Space

Which statement below describes a volcano?

• A vent or opening that expels magma from Earth’s exterior

• A vent or opening that expels magma from Earth’s interior

• A vent or opening that expels lava from Earth’s interior

• A vent or opening that expels lava from Earth’s exterior

At what plate boundary do volcanoes usually form?

• Transform plate boundary

• Divergent plate boundary

• Convergent plate boundary

• Extensional plate boundary

Which statement justifies the occurrence of a number of volcanoes in the Pacific Ring of Fire?

• The magma is most active in the peripheral areas of the Pacific Ocean Basin

• The peripheral areas of the Pacific Ocean Basin contain the boundaries of several plates where subduction takes place

• Earthquakes and tsunamis occurred when these volcanoes were formed, thus, changing the landscape

• The plate beneath the Pacific Ocean is constantly moving, thus, forming more volcanoes

What is the molten material found on the surface of a volcano after a volcanic eruption?

• Magma

• Lahar

• Silica

• Lava

Where do molten materials found on Earth’s interior?

• crust

• inner core

• outer core

• mantle

What government agency monitors the volcanic activities in the Philippines?

• Philippines Institute of Volcanology and Signals

• Philippine Institute of Volcanoes and Signals

• Philippine Investigative for Volcanoes and Seismology

• Philippine Institute of Volcanology and Seismology

A volcano is found to have felsic magma, which is very thick. What type of explosion will most likely happen?

• Effusive

• Explosive

• Effusive and explosive

• none

What statement below CORRECTLY describes the viscosity of molten material in the given picture?

• The temperature is low, high in silica content, and with a low amount of gas

• The temperature is high, high in silica content, and with a low amount of gas

• The temperature is low, low in silica content, and with a low amount of gas

• The temperature is high, high in silica content, and with a high amount of gas

What statement below CORRECTLY describes the viscosity of molten material in the given picture?

• The temperature is high, low in silica content, and with a low amount of gas

• The temperature is low, low in silica content, and with a high amount of gas

• The temperature is high, high in silica content, and with a high amount of gas

• The temperature is high, low in silica content, and with a high amount of gas

As temperature of magma increases, viscosity of magma ____________________.

• increases

• decreases