Which chemical equation best illustrates the law of conservation of mass? (my d)

2h2o yields h2 + o2

ch4 + 3o2 yields co2 + 2h2o

al4c3 + 3h2o yields ch4 + 4al(oh)3

zn + 2hcl yields zncl2 + h2

In an investigation that uses the scientific method, which step immediately follows making a hypothesis? o summarizing the results o asking a question o making observations designing an experiment mark this and retum save and exit next submit

6what is the importance of water on earth? a) it keeps the top layer of the geosphere cool b) it allows life to exist c) it provides ice at the poles d) it creates earth's blue color from space

Light waves can move through , but they travel fastest when they move through a(n) .