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Dry Falls is thought to be the greatest known waterfall that ever existed. Where is it?

in Iceland
in Canada
in the United States
in China
Dry Falls is a 3.5 mile long scalloped precipice in central Washington. According to the current geological model, catastrophic flooding channeled water over this 400-foot (120 m) rock face at the end of the last ice age. At this time, it is estimated that the flow of the falls was ten times the current flow of all the rivers in the world combined.
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35%
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80
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What kind of rock is marble?

sedimentary rock
smelted sand
metamorphosed limestone
congealed lava under a volcano

What rock is this?

gneiss
granite
halite
basalt

What is karst?

a kind of physical decomposition
a kind of chemical decomposition
a kind of biological decomposition
none of the above

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Philippine Islands
Indonesian Islands
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Comoro Islands