Analysis of air bubbles trapped in fossils, such as in fossil amber, show that our air in earliest times contained about 35% oxygen. Today, the average oxygen content of our air is approximately 20%. In some larger, more polluted cities, oxygen content in the air has been measured at 12 - 15%.
There are 297 words which start with 'pen'. 3 letter words starting with 'pen': pen. 4 letter words starting with 'pen': pend. pens.
Words that start with fatigue Found 4 words that start with fatigue. Browse our Scrabble Word Finder, Words With Friends cheat dictionary, and WordHub word solver to find words starting with fatigue. Or use our Unscramble word solver to find your best possible play! Related: Words that end in fatigue, Words containing fatigue. Scrabble; Words With Friends; WordHub; Crossword