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General Knowledge
An event involving a significant number of people and/or significant economic damage
An event involving a significant number of people and/or significant economic damage Disaster
The deepest parts of the channel along the length of the stream bed
The deepest parts of the channel along the length of the stream bed Thalweg
Lenses of pure ice developed in permafrost sediment
Lenses of pure ice developed in permafrost sediment Segregated Ice
An abnormally long wavelength wave produced by sudden displacement of water
An abnormally long wavelength wave produced by sudden displacement of water Tsunami
Topographic line or boundary separating watersheds
Topographic line or boundary separating watersheds Drainage Divide
Formed on the ceiling of a cavern when water percolates through fractures in limestone
Formed on the ceiling of a cavern when water percolates through fractures in limestone Stalactite
Slope of the river channel; typically decreases downstream
Slope of the river channel; typically decreases downstream Gradient
A large steep-sided volcano consisting of layers of ash, fragmental debris and lava
A large steep-sided volcano consisting of layers of ash, fragmental debris and lava Stratovolcanoes
A mudflow associated with volcanic action or involving volcanic materials
A mudflow associated with volcanic action or involving volcanic materials Lahar
The amount the fault or ridge moves away from its point of origin (aka displacement)
The amount the fault or ridge moves away from its point of origin (aka displacement) Offset