![]() ![]() As we look more closely, we’ll discover many other features of our planet. Of course, this is what we see only on the broadest scale. surface feature 3: regions of land or ocean that are covered by ice.If we consolidate the ideas discussed in the Activity above, you’ll realize that the images show four major features of our planet, three of which mark the surface and one that lies above the surface: Also note that, as we’ll discuss later, the presence of oceans also implies the existence of air, though this is something we know only with a deeper understanding of the role of air pressure. The clouds tell us that Earth must have air, even though you can’t see air itself.Oceans, because oceans cover most (about ¾) of Earth’s surface. ![]() More generally, ice is most commonly found in polar regions. ![]() In Figure 4.1, Greenland is obviously ice covered.The comparison with a globe should allow students to see the full outlines of North and South America in Figure 4.1. ![]()
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