No, not everyone celebrates Earth Day. That would be great, but there are still many who do not celebrate it.
Good!
People celebrate Earth Day in the US but they do also celebrate it in other countries every year and is celebrated Wednesday April 22, 2009.
every one but you
Mars's day-length is close to that of Earth: 24.7 hours. As such, there are 1.03 Martian days per every one Earth day; or, alternatively, 0.97 Earth days per every one Martian day.
Yes, every 24 hours the earth rotates on its axis once. This is one day.
day
Yes, one day is enough to celebrate Martin Luther King's birthday as an official federal holiday. We can practice the principles he stood for every day, which is actually a higher honor to him than a one day observance.
One Earth Day passes.
one day every month so it makes 12 days
Obviously every state in the u.s unless you mean how many states in the world celebrate it i don't know that one.
It was first celebrated in 1974. Under the theme "Only One Earth".
This depends on what you are specifically referring to. A "day" can be defined as one full rotation of a planet around its axis; as such, relative to Mars itself, Mars will complete one rotation per every one Martian day. Relative to Earth, however, the answer would be different. Mars's day-length is close to that of Earth: 24.7 hours. As such, there are 1.03 Martian days per every one Earth day; or, alternatively, 0.97 Earth days per every one Martian day.
Old answer: Every day. New one : I think every year.