Who was the first u. s. president to travel to communist china and moscow?
a.
richard nixon
b.
bill clinton
c.
george h. w. bush
d.
jimmy carter

Who ever answer first get ! question 1 : which pair of words names two processes for treating water to make it clean? a. aeration, precipitation b. coagulation, refurbishing c. filtration, coagulation d. combustion, aeration question 2: which act did the u.s congress pass in 1972 to protect th nation's water? a. anti-pollution act b. watershed protection act c. clean water act d. nixon act