| A | B |
|---|
| rock | a natural, solid piece of minerals |
| rock | It is not nice to throw _________ at cars. |
| mineral | a natural, inorganic, solid substance |
| mineral | Rocks usually contain many ___________. |
| inorganic | composed of matter other than plant or animal |
| inorganic | Rocks don't move or breathe. They are not alive. They are _________. |
| substance | physical material from which something is made |
| substance | Popcorn has a lot of air but not much _____________. |
| bind | to cause to stick together ; to make secure by tying b : to confine, restrain, or restrict |
| bind | The police have to ________ your hands when they arrest you. |
| sedimentary rock | a rock formed by pieces of rock being bound together |
| sedimentary rock | Sandstone, a rock made up of small pieces of sand, is _____________. |
| igneous rock | rock formed from melted rock that cools and hardens |
| igneous rock | A volcano produces ___________ rock. |
| metamorphic rock | a rock that has been changed by heat, pressure, or chemical action. |
| metamorphic rock | It is common to find ________ rocks in mountains, which have undergone great pressure. |
