9. explain how band ratios can be used to reduce topographic shading and emphasise areas of images with high levels of clays and iron oxides. mention any advantages and disadvantages of this technique

answer; i thinking 4.5 million. in sydney australia;

water: cools down faster, heats up faster, idk the last one

land: cools down slower, heats up slower, idk the last one

edit: if anything i answer is incorrect, i'm sorry. double check my work with someone else before using it. you for understanding.