Which of the following reactions show a decrease in entropy? a. cao(s) + h2o(l) ca(oh)2 (s)
b. 2h2o (l) 2 h2 (g) + o2 (g) c. h2co3 (aq) co2 (g) + h2o (l) d. 2kclo3 (s) 3o2 (g) + 2kcl (s)

Subduction zones occur on earth where dense oceanic crust dives under more buoyant continental crust. these boundaries are characterized by a deep ocean trench next to a high continental mountain range, large numbers of earthquakes and volcanoes. all of this is further evidence for the a) big bang theory b) origin of the species eliminate c theory of plate tectonics d theory of natural selection 4 sedimentary rocks found high in the himalayen mountain

Iknow #2 is d. i just need to know why

List four observations that indicate that a chemical reaction may be taking place