By simply focusing your attention on your breathing and without doing anything to change it, you can move in the direction of relaxation.â. This same philosophy is used in his well-known âThe 4-7-8 Breathing Exercise,â also called âThe Relaxing Breath,â which promotes better sleep.
A cave is a hollow place in the ground, specifically a natural underground space large enough for a human to enter. Caves form naturally by the weathering of rock and often extend deep underground. The word cave can also refer to much smaller openings such as sea caves, rock shelters, and grottos, though strictly speaking a cave is exogene, meaning it is deeper than its opening is wide, and a rock shelter is endogene. A cavern is a specific type of cave, naturally formed in soluble rock with the
1 Most of the caves in the world-as well as the largest-are of this type.  lava caves are tunnels or tubes in lava formed when the outer surface of a lava flow cools and hardens while the molten lava within continues to flow and eventually drains out through the newly formed tube.