A. at least I think it is
Wind, it takes nothing to use wind, which means it doesn't put harmful emissions into the atmosphere.
14.6 million square miles is the area surface of the moon
the moon is 80 times less than earth
It's a mechanism In a clock or watch that alternately checks and releases the train by a fixed amount and transmits a periodic impulse from the spring or weight to the balance wheel or pendulum.
In the age of exploration.... Prince Henry showed the Portuguese how to navigate by studying the sun and stars until later on, he showed them the compass navigation as the only technology advance which made possible for them.
