But the reality is, that there is no gravity, there is no nature. There is just Hashem. Every time that apple falls it is because Hashem made it happen. And that why once in a while gravity doesn’t work and you have crias yam suf. Because Hashem is the one doing it. Now Hashem keeps things going in a natural way so we could be tested in either believing in nature or Him.
My Rebbi once told me that there is a difference beteen Hashgacha Pratis and Klallis – Hashgacha Pratis is where HKB”H arranges every detail Personally – however, there is something called Hashgacha Klallis, a.k.a Nature, where HKB”H placed a koach in the briah to continue in a natural form.