<section><h2>Optical topic 4d quiz</h2><p><p><span style="color: rgb(58, 52, 58);">This quiz will recap some of the ideas in topic 4d - Short-term urban expansion and change</span></p></p></section><section><h2>What is the term typically used to describe the process of land cover change from fertile land to dry, arid landscape?</h2></section><section><h3>When can optical EO data be used to observe populated areas?</h3></section><section><h3>What changes in soil properties can we identify using Earth observation data?</h3></section><section></section><section></section>