The lowest temperature measured during that time was 0 degrees Fahrenheit (-18 Celsius) on January 31, 1949.
Fiefs are upper class nobility is the answer<span />
It is because of their humid continental climates. Warm hot summers and cold winters.
Here are some sources of ocean pollution:
<span>Oil. Petroleum products used for fuel are mined from the earth deep below the ocean surfaces.
Dumping.
Sewage.
Air Pollution.
<span>Agricultural Runoff</span></span>