The Arctic Ocean is the smallest and shallowest of the world’s oceans. It is located around the North Pole and makes up only 4 percent of the world’s oceans.
Heating and cooling can change water from one state of matter to another.
The Volga is the longest river in Europe. It begins northwest of Russia and flows very slowly south to the Caspian Sea. It is connected by canals to the Baltic Sea, Black Sea and Don River. Because of its importance to the Russian people, they often call it Mother Volga.
The Nile is the longest river in the world. It’s 4,180 miles long and flows through Egypt and nine other countries in Africa. It empties into the Mediterranean Sea.
Water on Earth is found either above the ground, below the ground or in the air. Surface water is water that is above the ground. Oceans, rivers, lakes and streams are all forms of surface water. Groundwater is water that is under the ground. Water that is in the air is called water vapor.
The density of an object is determined by how close molecules are to each other in a certain space. The closer they are, the more dense the matter.
Antarctica is constantly covered by a layer of ice. The average thickness of the ice sheet is 5,900 feet.
