Types of Volcanoes
What are the 3 areas that volcanoes form?
What are convergent boundaries, divergent boundaries, and hot spots.
This is molten rock above ground.
What is lava?
True/False:
About 100 volcanoes erupt every year.
False, only about 60 erupt every year.
This is a volcano that is unlikely to erupt soon.
What is a dormant volcano?
More than 60% of volcanoes occur along...
mid-ocean ridges
This is molten rock below ground?
What is magma
a liquid's resistance to flow
What is viscosity?
This is when magma heats water underground and it is trapped.
What is a geyser?
When an oceanic plate sinks below a continental plate, it is called a _________________.
subduction zone
This material changes the thickness of lava.
What is silica?
Melted snow and ice mix with ash from a volcano to create ______.
What is a mudflow?
This is one benefit of volcanoes for life.
What is fertile soil?
This is the most explosive volcano
What is a composite volcano?
Volcanoes form in these areas that are not associated with plate boundaries.
hot spot
What 3 dissolved gases are found in magma/lava?
What are carbon dioxide, sulfur dioxide, and water vapor.
What is a lahar?
These two other planets have extinct volcanoes similar to earth.
What is Venus and Mars?
This is a hole left by the collapse of a volcanic mountain.
What is a caldera?
This forms when two continental plates collide
a mountain
What is an ash fall?
This is an explosion of ash cinders and bombs from a violent volcanic eruption.
What is a pyroclastic flow?