This is molten rock that has formed deep within Earth and rises to the surface.
What is magma?
100
This is a place where 2 lithospheric plates collide, either 2 oceanic plates or 1 oceanic and 1 continental plate. Volcanoes always form on the overriding plate in either case.
What is a subduction boundary?
100
This is the main ingredient in all magma and determines the type of magma it will be.
What is silica?
100
The landform of a volcano is formed from this material.
What is lava and pyroclastic material?
100
This is what maria on the moon's surface mostly consists of.
What is basaltic lava flows?
200
This causes most of the asthenosphere to be solid and therefore raises melting temperatures of materials there.
What is pressure from the lithosphere?
200
Most of the magma that reaches Earth's surface does so here.
What is a divergent boundary?
200
This term is used to describe a liquid's resistance to flow.
What is viscosity?
200
These kinds of volcanic landforms come from when lava builds up in layers and forms gently sloping sides.
What is a shield cone?
200
This is what is believed to have provided the energy for volcanic activity on the moon to have occurred.
What is radioactive elements beneath the moon's surface?
300
This is one condition that will form magma. It often takes place along the rift valley of the mid-ocean ridge because the lithosphere is thinner there.
What is decrease pressure and lower melting point?
300
This is a place where volcanoes form when 2 plates are pulled apart and a rift forms. At the rift more magma can form because the lithosphere is thinner here, and the magma being less dense than a solid will rise.
What is divergent boundary?
300
This is a kind of magma that has the least amount of silica and gas content. This magma flows freely from volcanoes.
What is basaltic magma?
300
This kind of volcanic landform forms when molten lava is thrown into the air from a vent and falls down hitting the ground, and breaking apart the fragments.
What is a cinder cone?
300
This is the largest known volcano in the solar system and is located on Mars.
What is Olympus Mons?
400
This is a condition that magma can form in the asthenosphere under and often occurs at hot spots.
What is increase temperatures?
400
This is a place where volcanoes form not at plate boundaries.
What is a hot spot?
400
This type of dried lava flow comes from a cooler basaltic lava that moved more slowly and cooled quickly forming lava with rough, jagged surfaces.
What is aa?
400
This type of volcanic landform forms when layers of materials from successive explosive eruptions accumulate around a vent. The material includes hardened lava and pyroclastic material.
What is a composite volcano?
400
There are over 1600 large volcanoes on this planet with countless smaller ones. Most of them are very flat, shield cones.
What is Venus?
500
This is a condition magma can form under and often occurs at subduction boundaries. It will result in lowering melting points.
What is increase the amount of water in the asthenosphere?
500
This is an underwater volcano known as a seamount in Hawaii and scientists have been studying it up close since 1996.
What is Loihi Seamount?
500
This type of lava forms from underwater volcanic eruptions. It hardens into rounded lumps.
What is pillow lava?
500
After a volcano collapses, sometimes magma beneath it is released, forming a large crater-shaped basin. These form at the summit of the volcano.
What is a caldera?
500
This is the location of one of the most volcanically active places in the solar system. It is caught between a tug of war between Jupiter and moons causing its surface to rise up and fall down regularly.