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