Return to Science Grade 2   Glossary   Choose a Letter | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |   List of words for Letter 'V' Click on    to hear the word and definition. vibrate to move back and forth  When a string vibrates, you can hear sound. volcano a mountain formed when hot, melted rock builds up and bursts through the surface of Earth  Mt. St. Helens is a volcano that erupted in 1980. volume the amount of space that a thing takes up  You can measure the volume of a liquid with measuring cups. Leave Glossary