Earth
Fold occurs when rock buckles up to form an arch-like structure
What is anticline
What is a caldera
What is lapilli
What is volcanic block
Volcano formed by partly explosive eruptions of ash and rock fragments and partly by mild lava flows
What is a composite volcano
Area between upper and lower mantle
What is the transition zone
Channel where gases, ash, and molten rock are ejected from the interior of the earth
What is a vent
Hardened lava with a surface that is smooth or ropy
What is pahoehoe
Hardened lava that forms rough, jagged rocks with a crumbly texture
What is aa
Underground channel that is formed when surface lava hardens first
What is lava tunnel
How domed mountains are formed
What is molten rock pushed up rock layers without reaching the surface
What is a cinder-cone volcano
What is volcanic ash
Bottom of the mantle
What is the core-mantel boundary (Gutenberg discontinuity)
Opening through which hot gases, ash, and molten rock are ejected from the interior of the earth
What is a volcano
What is oxygen
Volcano that will probably never erupt again
What is an extinct volcano
Superheated cloud of gas and small particles that travel as an avalanche
What is pyroclastic flow
Computer system that stores and processes geographic data
What is the geographic information system (GIS)
Fracture zone between stationary and moving rocks
What is fault
Boundary line between crust and mantle
What is the Moho
What is a dormant volcano
Lava in water solidifies almost instantly, forming rounded structures
What is pillow lava
Idea that rocks on either side of a fault spring to a position of little or no stress after an earthquake
What is elastic rebound
Determines where an earthquake begins
What is the measuring of the seismic waves