Fill in the blanks in the picture. Provide Explanation.

What must occur for air masses to form fronts

What best discribes the relationship between wavelength and frequency in a electromagnetic wave

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u.s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?