Which of the following is a synthesis reaction? c2h4 + 3o2 yields 2co2 + 2 h2o 2hcl yields h2 + cl2 2k + 2hcl yields 2kcl + h2 so3 + h2o yields h2so4

What role does weathering have in shaping earth’s surface? a) it allows sediments to fall out of a medium. b) it sediments settle on a new surface. c) it breaks down older material into sediments. d) it transports sediments to a different location. will give brainliest, answer quickly.