| A | B |
|---|
| vugs | small to medium-sized cavities inside rock that may be formed through a variety of processes |
| frost | when the temperature is cold and water freezes |
| particles | extremely small pieces of something |
| tide | the regular rise and fall in the level of the sea |
| decay | to gradually become bad or weak or be destroyed |
| rub | to move a substance backwards and forwards over a surface so that it covers it |
| dry up | If a river or lake dries up, the water in it disappears |
| expose | to remove what is covering something so that it can be seen |
| blow | to make a current of air |
| rock | the hard, natural substance which forms part of the Earth's surface |
