It is true that "if it rains, the ground gets wet." In the morning, Meera sees the ground is wet…

Why

Meera is running the true rule ('rain makes the ground wet') BACKWARDS, treating it as if it also means 'wet ground means it rained' — but a rule pointing one way does not automatically work in reverse. Rain is one way the ground gets wet, but far from the only one: someone could have watered a garden, a pipe could have leaked, morning dew could have settled, a sprinkler could have run. All of these make the SAME observation (wet ground) true, without rain being the cause — so seeing the effect does not prove which cause produced it. Test it: this exact mistake has a name — 'affirming the consequent' — and the fix is always the same, look for something that only rain (and nothing else) would leave behind, like puddles on a car's windshield facing the sky, or check a weather report. Her father is right: wet ground could have several different causes — seeing the effect does not prove rain was the one that happened.