Please answer this question fast

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

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?

Which example is a mechanical wave?     a. microwave    b. radio wave    c. water wave    d. ultraviolet light