A weak spot in the crust where molten material comes to the surface
What is a volcano?
100
Two types of hardened lava.
What are pumice and obsidian?
100
(T/F) The more silica present in magma the thicker it is.
What is true?
100
Four landforms created by lava and ash.
What are shield volcanoes, composite volcanoes, cinder cone volcanoes, and lava plateaus?
100
The four planets in our solar system with evidence of volcanic activity.
What are Earth, Mercury, Venus, and Mars?
200
Components of magma.
What is a molten mixture of rock-forming substances, gases, and water from the mantle?
200
Place where magma forms.
What is asthenosphere?
200
Forms when high-silica lava cools very quickly.
What is obsidian?
200
(T/F) The Hawaiian Islands are an example of Composite Volcanoes.
What is false? (shield volcanoes)
200
The type of rock found in the dark places on Earth's moon.
What is basalt?
300
(T/F) Most volcanoes occur along diverging plate boundaries.
What is true?
300
This is responsible for carrying magma to the surface.
What are gases?
300
Rock that is formed from low-silica lava.
What is basalt?
300
(T/F) Lava Plateaus are due to thick lava.
What is false? (they are due to thin, runny lava which travels far before cooling and solidifying).
300
The most common type of volcano on Venus.
What is Pahoehoe?
400
(T/F) The mid-ocean ridge is an example of a converging boundary.
What is false? (Diverging plate boundary)
400
Magma rises through the lithosphere via this structure.
What is the pipe?
400
Tiltmeters and laser-ranging devices.
What are two devices used by geologists to predict volcanic eruptions?
400
A mass of rock formed when a large body of maya cools inside the crust.
What is a batholith?
400
The biggest shield volcano in our solar system.
What is Olympus Mon on Mars?
500
This is created when older, denser plates dives under another plate creating a deep-ocean trench where it melts, forming magma then seeping upward through cracks in the crust.
What is an island arc.
500
Four things affecting the force of a volcanic eruption.
What are amount of gas dissolved in magma, viscosity of magma, temperature of magma, silica content of magma?
500
(T/F) A pyroclastic flow will most likely lead to deposition of basalt.
What is true? (Pyroclastic flow is an explosive eruption due to thick magma).
500
The Black Hills are an example of this.
What is a dome mountain? (rising magma is blocked by horizontal layers of rock, the rock is forced upward into a dome shape).
500
(T/F) Io has nitrogen volcanoes.
What is false? (Io has sulfur volcanoes, Triton has nitrogen volcanoes).