Structure of the Land: Our planet is made of trillions of tons of rocks and minerals. Deep within the earth, high temperatures keep much of the interior in molten form. Earth’s outer crust is made up of large plates that slowly glide or drift over this molten interior. We can see the signs of continental drift by observing the creation and evolution of landforms, such as mountain ranges. Natural forces are also constantly at work as they slowly erode high peaks and carve deep valleys.
How satellites help us: Large geological features, including fault lines and volcanoes, are visible in images collected from space. Satellite images are used to map and understand these structures. Data from remote sensing satellites are also used to interpret geological history by identifying different rock types and probable features under the earth’s surface.