*Sigh* It's important because conserving energy helps the environment and lets you have a little more pocket money when the bills come around.
<span>Humans have 23 Chromosomes </span>
The most abundant source of methane in the globe is coal-fired power plants.
0-4 degrees Celsius, below which bacteria grow very slowly. This is the same as refrigerator temperature.
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Lunar maria (plural form of the Latin word mare, which means sea) are dark surfaces that can be found all over the moon (17% of the Moon is covered in them) that have been created as a result of volcanic eruptions. These areas are made up of basalt, and given that they seemed almost waterlike, the astronomers in the distant past mistook them for seas, whence their name comes.
When it comes to craters, their origin is quite similar - volcanic eruptions created them. When lava starts erupting from a volcano, it has to get out from somewhere - and thus craters are created. If you are referring to lunar craters, however, there are many speculations as to how they were created: due to volcanic eruptions, meteoric impact, or glacier activity.