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☆☆☆☆☆nebula
The Earth's mantle comprises the bulk of the Earth.
EPA
13.5 billion years
The term magnitude is used to describe the size of an earthquake.
machines
On the surface of the Earth, I would expect the days to be the longest
at the north and south poles, where the sun stays above the horizon,
just going around and around the sky, for six months at a time.
Regarding the question of "when" ... If you split the year into two pieces, between
March 21 and September 21, then the piece with June 21 in the middle is light at the
north pole and dark at the south pole, and the piece with December 21 in the middle
is the opposite situation.
Engineer
All carbon based fuels produce carbon dioxide when burned. These include:
- fossil fuels (coal. oil, natural gas)
- alcohols
- bio-fuels (wood, charcoal, waste burning including cremation)
- specialty industrial fuels (acetylene etc.)
- carbon monoxide
Coal and petroleum are the two primary fossil fuels. Oxidizing methane also releases CO2, but that is 25 times better than releasing methane, itself an even more potent greenhouse gas.
In 2006, a planet became defined as a body orbiting the Sun that has a mass of self gravity sufficient enough to make it nearly round, and has a clear orbit.
A+ planet
Water vapor in the air compared to the amount of water vapor that air could hold at a given temperature.
Supernova
hail
