The jet streams follow the contours of low and high pressure areas (troughs and ridges), which move like waves in the atmosphere across the earth. How does the polar jet stream impact winter weather in the Northern Hemisphere? A) The polar jet stream moves south brings large amounts of snow and ice. B) When the polar jet stream dips farther south and brings colder temperatures. C) The polar jet stream bumps into the stronger tropical jet stream causing lots of rain and snow. D) The polar jet stream moves horizontally across the United States, causing colder temperatures in northern states only.

the formula would be mgso4

mgso[subscript]4

a:

by the combination of an unlimited number of elements

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).

a