Does the earth lose water into space, and if it does, is
the earth replenished water through meteorites or other forms of space
type influxes of water, gas,or rock?
The earth is continuously, but extremely slowly, losing it's atmosphere
to space, including water vapor. It is not replenished, except perhaps
by catching some water vapor from the tail of a comet that passes by.
Some water vapor is always coming out of the earth's crust through
volcanic action, so the atmosphere's water content does not change.
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Update: June 2012