Browse the glossary using this index

Special | 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 | ALL

U

Ultrasound

sound with a frequency / pitch above the range of human hearing

Uplifting

the process of rocks being moved from deep underground to the surface of the Earth