The more cropping you do without switching crops depletes the nutrients needed for the certain crop you are growing, Ways to combat it are rotating the crops annually (pretty sure burning the crops every once in a while as well)
The atmosphere<span> of </span>Uranus<span> is </span>composed<span> primarily of hydrogen and helium. </span>
"and", and "the" are some i think
The ratio of starlight to sunlight is much, much smaller than 0.5%. A value of 0.0000001% is far more accurate.