Sometimes I fly as fast as the speed of light. Sometime I crawl as slow as a snail. Unknown until I am measured but you will certainly miss me when I'm gone. What am I?
Upon me you can tread, though softly under cover.
And I will take you places, that you have yet to discover.
I'm high, and I'm low, though flat in the middle.
And though a joy to the children, adults think of me little.
For me, much blood has been shed.
I have two faces but only bear one head.
What am I?
I occur twice in eternity. And I'm always within sight.See answer
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