When your professor stands in back of a podium, you perceive your professor as being further away than the podium because the podium blocks the vision of the professor's body. this is an example of the depth cue?

occlusion              

Explanation:

Occlusion, in psychology (memory research), is described as a phenomenon in which different items are being associated or connected with the similar cue as a particular target blocking or hampering the 'successful' retrieval of the given target via various strength-dependent 'response competition'

Example: Tip-of-the-tongue phenomenon.

The correct answer is 'occlusion'.

d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer