This document defines and describes different types of landforms and bodies of water on Earth's surface. It explains that landforms are natural shapes found on land, and includes mountains, hills, valleys, plains, plateaus, rivers, lakes, cliffs, and glaciers as examples. It also defines oceans as the largest bodies of water, covering 70% of the planet, and influencing weather and temperature. Seas are described as smaller than oceans and partly enclosed by land.