| A | B |
|---|
| atmosphere | the pocket of air that surrounds the Earth |
| axis | an imaginary line running from the North Pole to the South Pole through the center of the Earth |
| rotation | the spinning of a planet or moon on its axisz |
| crust | the solid rock that makes up the outer layer of Earth |
| mantle | the layer of hot, flowing rocks beneath Earth's crust |
| core | the center of the Earth |
| surface | the outermost covering or layer of the Earth |
| lithosphere | the rocky surface of the Earth |
| hydrosphere | all the water on the surface of the Earth and underground, including ice and water vapor |
| Earth composition | the Earth's surface is composed of 25% dry land and 75% is covered with water |
| day | the time during rotation when Earth faces the Sun, and it is lighted; this rotation gives the false appearance that the Sun travels from east to west across the sky |
| night | the time during rotation when Earth faces away from the Sun, and it is dark; this rotation give the false appearance that the stars move across the sky |
