| aquifer | | A long, narrow chain of hills or mountains. |
| archaeologist | | The study of the ocean and its floor. |
| archipelago | | A large part of an ocean or sea with land around it. |
| axis | | The edge of a continent just below the surface of the ocean. |
| bay | | To sail or steer a ship, airplane, or other vehicle. |
| canal | | The path taken when going from one place to another. |
| caravan | | A stream or river that flows into a larger river. |
| cargo | | A group of desert travelers with their animals and goods. |
| coast | | A spacecraft carrying scientific instruments to record or report back information about planets or other objects in outer space. |
| colony | | A seasoning made from plants and used to flavor food. |
| continent | | A long, deep, narrow area like a valley or canyon in the ocean floor. |
| continental shelf | | A human-made object shot by rocket into an orbit around the earth or other heavenly body. |
| delta | | A very high hill. |
| equator | | A narrow waterway that connects two larger bodies of water. |
| feature | | The load of goods carried by a ship. |
| geography | | The part of a river where its waters flow into some other body of water, usually a lake or ocean. Also, the opening of a harbor or bay into the ocean. |
| globe | | Half of a sphere. |
| gulf | | Any of five major divisions of the great body of salt water that covers almost three-fourths of the earth. |
| harbor | | A fan-shaped deposit of dirt and sand that collects at the mouth of some rivers. |
| hemisphere | | A waterway dug across land for ships or small boats to go through. |
| hurricane | | A model of the earth. |
| instrument | | A narrow bridge of land, with water on both sides of it, connecting two larger pieces of land. |
| island | | One of the seven great masses of land on earth. |
| isthmus | | A body of water, usually fresh, surrounded by land. |
| lake | | A small area of sea or lake partly enclosed by land. |
| launch | | An imaginary circle around of the earth halfway between the North and South Poles. It divides the earth into the Northern and Southern Hemispheres. |
| merchant | | A land and people far away from the country that rules them. |
| mountain | | A person whose job is to make cloth from thread. |
| mouth | | The path of a satellite or ship as it travels around another body in space. |
| navigate | | An imaginary line through the earth around which the earth turns. |
| ocean | | To send off with force. |
| oceanography | | A tool to help you in your work. |
| orbit | | A trader or seller of goods. |
| peninsula | | An instrument for making distant objects appear closer and larger. |
| planet | | A large natural stream of water that flows into a lake or ocean. |
| probe | | A piece of land almost surrounded by water, or extending far out into the water. |
| ridge | | A person who is an expert in studying buildings, tools, pottery, weapons, and other objects of ancient times. |
| rival | | A thing that stands out and attracts attention. |
| river | | A ball-shaped object. |
| rotate | | A storm with violent wind and, usually, heavy rain. The wind blows at more than 75 miles (121 kilometers) per hour. |
| route | | The beginning of a brook or river. |
| satellite | | A large body of water underground. |
| sea | | A large body of matter, like the earth, that moves around the sun in space. |
| source | | A deep bay used to shelter ships. |
| sphere | | The study of the earth's surface, climate, continents, countries, peoples, industries, and products. |
| spice | | A journey by water, through the air, or through space. |
| strait | | A person or country who wants and tries to get the same thing as another; one who tries to equal or do better than another. |
| telescope | | Any large body of salt water, smaller than an ocean. Often it is a part of the ocean surrounded by some land or islands. |
| trench | | A group of many islands. |
| tributary | | The land along the sea; seashore. |
| voyage | | To turn on an axis. |
| weaver | | A body of land surrounded by water. |
