Question | Answer |
element | a substance that cannot be broken down into other substances |
viscosity | the amount of stuff in an liquid |
silica | makes things thicker in a element |
pahoehoe | hot fat-moving lava |
aa | cool slow-moving lava |
compound | a substance made of two or more elements that have been chemically combined |
lava | magma when it comes out of the volcano |
volcanic ash | fine rocky particles as small as a speck of dust |
crater | forms at the top of a volcano around the central vent |
lava flow | at the top of the volcano around the central vent |
cinders | pebble sized particles |
bombs | particles ranging from the size of a baseball to the size of a car |
magma | a molten mixture of rock-forming substances, gases, and water from the mantle |
shield volcano | gently sloping mountain formed by repeated lava flows |
cinder cone volcano | cone shaped mountain formed from ash,cinders,and bombs |
composite volcano | mountain formed by lava flows alternating with explosive eruptions |
caldera | hole left by the collapse of of a volcanic mountan |
magma chamber | a chamber of magma under a volcano |
batholith | forms when a large body of magma cools inside the crust, this mass of rock will form |
lava plateau | high, level area formed by repeated lava flows |
sill | forms when magma squeezes between layers of rock and hardens |
dike | forms when magma forces itself across rock layers and hardens |
vent | where the magma leaves the volcano through an opening |
pipe | a long tube that connects the magma chamber to the Earth's surface |
hot spring | groundwater heated by a nearby body of magma, rises to the surface and collects in a natural pool |
geyser | is a fountain of water and steam that erupts from the ground |
Ring of Fire | formed by the many volcanoes that rim the Pacific Ocean |
dormant | a volcano that is not unlikely active now but may become active in the future |
active | a volcano that is erupting or has shown signs that it may erupt in the near future |
extinct | a volcano that is unlikely to erupt again |
subduction | |