Answer:
huh? do you need help on math?
Explanation:
what do you mean?
Using physical means such as electrostatic filters or mechanical filters :)
So the question is asking for time.
Time= distance / speed
120/30
4
Therefore answer is d
Answer:
Electric is produce by water it is very helpful in our life
While rotating around Earth the Moon also rotates around it's axis. These two rotations have almost same duration (27.3 and 27 days respectively). This is the reason why we always see the same side of Moon.
The dark part of a Moon is the part where there is night on the Moon, meaning there is no sunlight visible. This dark part depends on the Moon's position relative to Earth and Sun. The change in size is due to part of Moon-day. Dark part of Moon has night, bright part has day and the boundary has either sunrise or sunset.
