Figure $4\mathrm{.}6$: Remote Sensing Platforms. ${?}^9$

$16.$ Use Your Critical Thinking Skills: Why do you think there are so many applications, or uses, of remotely sensed data? Explain your response in at least one sentence.

$17.$ Apply What You Learned: Let's say you are looking out onto the Earth's surface from a window seat on an airplane. Would your eyes be considered active or passive remote sensors$?$ Explain your response in at least one sentence.