You walk into a room and know that there's something you need, but in order to remember it, you have to go back to the room you started in and use your surroundings. this illustrates:

The answer is: The importance of retrieval cues in memory
Retrieval cues refers to the things that become a stimuli for you to retrieve a certain memory.
In the scenario above, the environment in your room become a stimuli for you to retrieve the information on the things you need when you walk out from your room.

Bob: coke is baby pandas.jim: what? how do you figure that coke is baby pandas? bob: because this book says so.jim: how do we know the book is correct? bob: because it says that coke is baby pandas.jim: how does that prove the book's accuracy? bob: because it's statement involving coke and baby pandas is correct, therefore it is accurate.jim: how do we know that it's correct? bob: because we have concluded that the book is accurate, and therefore the statement is correct.therefore, coke is baby pandas.