Earth's atmosphere ancient
Ken Kovacs
Words about how early Earth gathered breathable air. Scientists say plankton floted into the air. From five million year old rocks.
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| 1 | b | s | s | a | m | o | u | n | t | o | u | s | n | a | r | c | i | i | l |
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| 12 | h | c | s | i | f | e | i | i | a | d | r | a | a | n | h | d | s | t | t |
| 13 | c | a | n | f | s | s | o | r | r | e | v | o | l | u | t | i | o | n | y |
| 14 | i | r | n | e | s | x | s | t | v | s | u | l | f | u | r | t | e | e | c |
| 15 | r | b | n | o | i | l | l | i | m | a | t | o | r | i | g | i | n | c | c |
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Some of the puzzles that people list for the public
get indexed by the search engines
(like Google).
Some people find those puzzles and cannot figure out how to make a puzzle
of their own. So this page now has the navigation sidebar.
There are now buttons on the puzzle so that you can get a clean page,
in either HTML or PDF, that you can use your browser's print button
to print. The PDF format allows the web site to know how large a
printer page is, and the fonts are scaled to fill the page.
The PDF takes awhile to generate. Don't panic!
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