| A | B |
|---|
| atmosphere | the layer of gases that surrounds the Earth |
| hydrosphere | all the water on the surface of the Earth |
| Earth | the planet you live on |
| inner core | the innermost layer of Earth; made of solid iron and nickel |
| outer core | layer of inner Earth that is made of liquid iron and nickel |
| mantle | the thickest layer of inner Earth |
| crust | the outermost layer of Earth |
| asthenosphere | the section of the mantle made of partly melted rock |
| lithosphere | a rigid layer made up of the solid outer part of the mantle and the crust |
| geosphere | another name for lithosphere |
| biosphere | part of Earth where living things are found |
