Pinacoids must combine with another crystal form to make a crystal, and often form the top and bottom of prismatic crystals. plutonic -. formed of magma cooled beneath the Earth's surface. polymictic -. a conglomerate or breccia which has clasts of different rock types.
As the sun heats the ground or ocean, warning them, the air near the ground or ocean warms and becomes less dense As this happens the air begins rising, which lowers the air pressure at the Earth's surface. A large area of low pressure created this way is called a thermal low.
Sign up to view the full document. 38 where air sinks as in the subtropical horse. This preview shows pages 7â10. Sign up to view the full content. 38. Where air sinks, as in the subtropical horse latitudes, the air usually _ cools as it sinks creates high pressure locally creates low pressure locally increases in relative humidity as it sinks 39.