Does the earth create more water or is it always the same level?

Earth is creating more water, but the quantity being "created" in
recent centuries is miniscule.  Free hydrogen and hydrogen compounds
escapes from the ground and are oxidised to water in Earth's
atmosphere. Micro-organisms oxydise free hydrogen and hydrogen
compounds to water. Should we say the water created by man and other
creatures was "created" by the Earth? Comets and asteroids bring new
water to Earth, but it does not seem correct to say Earth created this
water. Water is disassociated = decomposed by ultraviolet light etc in
Earth's upper atmosphere and some of the hydrogen is lost into
space,long term.
It is believed Earth has more water than a few centuries ago, but the
gain is miniscule compared to the total amount of water on and beneith
Earth. "Always is too long a period to consider with accuracy.
Typically water tables close to the surface are shrinking, because
humans pump a lot of warer from wells. I'm sure there are even more
complications relating to your qestion.    Neil

You can find some helpful information at the following links:


US Geological Survey
The Water Cycle
http://ga.water.usgs.gov/edu/watercycle.html
"Although the balance of water on Earth remains fairly constant over
time, individual water molecules can come and go in a hurry. The water
in the apple you ate yesterday may have fallen as rain half-way around
the world last year or could have been used 100 million years ago by
Mama Dinosaur to give her baby a bath."

 
 
The Green Lane
Environment Canada
http://www.ec.gc.ca/water/en/nature/prop/e_here.htm
"In the hydrologic cycle, water evaporates from the ocean into the
atmosphere, from there it can precipitate back into the ocean, or onto
the land surface. From the land, it can evaporate or transpire back
into the atmosphere, or flow overland or percolate underground before
flowing back into the ocean. The distribution of the water around the
globe varies from season to season and year to year, but the total
quantity of water on the earth's surface remains essentially
constant."