Sunlight provides virtually all the energy in our world. Without
it, plants wouldn’t grow and we wouldn’t have food or daylight.
We wouldn’t even have fossil fuels such as coal and petroleum
because those were formed from vegetation that itself derived
energy from the sun. However, sunlight also contains ultraviolet
light, which can damage chemicals [...] How many days would it
take the earth to travel around the sun if it traveled at the
speed that the moon revolves around the earth? It takes twenty-
eight days for the moon to travel around the earth. To calculate
the speed the moon travels we must figure out what distance the
moon travels in those 28 days, or the circumference of the
circle the moon travels. The formula to calculate the
circumference of a circle is Pi(d) (the moon does [...] We get
the majority of our heat from the sun. The next largest source
is the core of the Earth itself. Then there’s a billion way tie
for the third biggest source of heat. Heat itself is the motion
of atoms, molecules an