Open Google Earth, and in the search box enter Great Barrier Reef, Queensland. What are some human actions that can harm the coral reefs? What evidence can be seen of these risks in this area? What is the evidence?
Zoom out until you can see Cairns on the mainland. Then zoom in and examine the area, particularly the areas just north of Cairns, near Barron. Look for activities that could contribute to murky water in the bay.