<section><h2>Optical 1a</h2></section><section><h2>When were the first aerial photographs taken?</h2></section><section><h3>Which of these is NOT an application of Earth Observation?</h3></section><section><h3>What do we call the part of the spectrum where most of the sun’s energy is concentrated?</h3><p><p><span style="color: rgb(58, 52, 58);">This quiz will recap on the concepts in Topic 1a - The early days of Earth Observation</span></p></p></section><section></section><section></section>