How does magma reach the Earth's surface during volcanic activity? A) Through seismic waves B) By evaporation C) Along conduits or pathways in the crust D) Via underground rivers
C) Along conduits or pathways in the crust
What is the distinctive feature of stratovolcanoe/composite volcanoes?
Tall, steep and conical shape
What characterizes an active volcano? A) Recent or ongoing eruptions B) No signs of volcanic activity C) Steep sides with a crater D) Symmetrical cone shape
A) Recent or ongoing eruptions
What type of volcanic eruption is characterized by the ejection of incandescent and firework like lava fragments, ash, and gas?
Strombolian eruption
What are wells used for in geothermal energy extraction?
Accessing and extracting geothermal fluid
What factor is NOT considered when determining if a volcano is active or inactive? a. Eruption history b. Magma composition c. Signs of unrest d. Tectonic activity
B. MAGMA COMPOSITION
25. Why is geothermal energy significant as a renewable resource?
It is sustainable and has minimal environmental impact
What is the main purpose of a steam separator in a geothermal power plant?
Remove water droplets from steam
Where is the magma chamber located? A) On the summit of the volcano B) Beneath the surface, below the crater C) In the atmosphere D) At the base of the volcano
B) Beneath the surface, below the crater
What happens when magma rises towards the surface and releases gas? a. It solidifies into igneous rock. b. It cools rapidly, forming crystals. c. It erupts explosively, releasing gas and lava. d. It becomes denser, sinking back into the ma
c. It erupts explosively, releasing gas and lava.
What converts the thermal energy of steam or hot water into mechanical energy in a geothermal power plant?
Turbine
How does geothermal energy work?
d. By tapping into the Earth’s heat through wells and using it to generate electricity or provide heating.
How do generators create electricity in geothermal power plants? a. Magnetic field interaction with rotating blades b. Solar panel absorption c. Fossil fuel combustion d. Chemical reactions
a. Magnetic field interaction with rotating blades
Which of the following is NOT a sign of unrest that scientists monitor in determining a volcano's activity? A.Unusual earthquake activity B.Geothermal feature changes C. New gas emissions D. Changes in vegetation around the volcano
D. Changes in vegetation around the volcano
Which of the following characteristics of a volcano depends on its magma emission? a. age b. size c. shape d. location
C. shape
Where is the vent of a volcano usually located? A) At the base of the volcano B) In underground caves C) At the summit or on the flanks of the volcano D) Near the ocean floor
C) At the summit or on the flanks of the volcano
What is the main characteristic of Plinian eruptions? A) Lava flows B) Frequent, mild explosions C) Large volumes of volcanic ash and gases D) Short, explosive bursts
C) Large volumes of volcanic ash and gases
What is the main benefit of reinjecting cooled geothermal fluid back underground?
Maintain reservoir pressure and prevent subsidence
What is lava?
Molten rock that reaches the surface during an eruption
What characterizes shield volcanoes?
Low-viscosity lava flows and gentle slopes
Give one type of lava flow
Basaltic Lava, Andesitic Lava, Rhyolitic Lava, Pillow Lava, Sheet Lava