隠れる and 隠す: hiding places and concealed objects
Compare a person's hiding place with concealing an object, including things obscured without intent, such as the moon behind clouds.
Where someone hid
子どもが木の後ろに隠れました。 says that the child hid behind a tree. に with 隠れる, read かくれる, marks the hiding place.
見つからないように、静かに隠れていました。 says that someone stayed quietly hidden to avoid being found. 隠れていた describes the continuing hidden state.
What someone concealed
プレゼントを引き出しに隠しました。 says that someone hid a present in a drawer. With 隠す, read かくす, を marks the object and に its hiding place.
驚いた顔を手で隠しました。 says that someone covered their surprised face with their hands. 隠す can conceal something without moving it elsewhere.
Being obscured without intention
月が雲に隠れています。 says that the moon is hidden by clouds. It implies no intention on the moon's part, so 隠れる is not restricted to human action.
失敗を隠さずに説明しました。 says that someone explained a failure without hiding it. 隠す can concern facts someone might prefer not to disclose, as well as visible objects.
Does 月が雲に隠れています imply deliberate action by the moon?
Show the answer and why
No. It describes the moon being obscured by clouds. 隠れる covers obscured states as well as deliberate hiding.