| The Earth's solid ____ may be as hot as the Sun's surface. |
erosion |
| An underwater earthquake could generate a ____. |
inner core |
| Clay, humus, sand, and silt are naturally found in ____. |
peat |
| The removal of sediments by wind or water is called ____. |
soil |
| A mineral's ____can be transparent, translucent, or opaque. |
temperature |
| Metamorphic rocks are created by high ____ and pressure. |
transparency |
| The ____ extends from the Earth's surface to the stratosphere. |
troposphere |
| Millions of years of heat and pressure converts ____ into coal. |
tsunami |
