What is the defining characteristic of an endothermic reaction?

Is this a scientific model? use complete sentences to explain why or why not. a graphic organizer showing the water cycle

14. complete and balance the equations for the single displacement reactions. a. zn + pb(no3)2 -> b. al + niso4 -> 15. complete and balance the equations for the double displacement reactions. a. agno3(aq) + nacl(aq) -> b. mg(no3)2(aq) + koh(aq) -> 16. complete and balance the equations for the combustion reactions. a. __ ch4 + o2 -> b. __ c3h6 + o2 -> c. + o2 ->

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains