Wat County School X
Zatorionce Robinson S: X
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Zatorionce Robinson-AX
Zatorionce Robinson-AX
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What does the underlined word "percolating"
mean as it is used on page 2?
bursting
seeping
If no constrictions keep it from rising, the
boiling water becomes a hot spring, slowly
percolating up to the surface and collecting
in a steaming pool or flowing off as a small
stream. In the case of geysers, the
underground water contains dissolved
minerals called silica. As the hot water boils
beneath the ground, it carries the silica
through narrow passages below the surface.
Like runny, wet cement, the silica coats the
walls of these passages, and, over time, it
makes them narrower.
Just like a teakettle with boiling water inside
and only a tiny hole on top, the heated water
reaches a point where it is under intense
pressure and must escape the narrow
passages in a huge explosion of hot water
rushing
dripping
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