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Geodes are formed in empty spaces inside rocks. Fluids containing minerals make their way into a rock’s cavity and crystals begin to grow. From the outside they look like an ordinary rock, although th ...
Nasal fossa: two cavities separated by a vertical plate. Air enters the nasal fossae through the nostrils and flows to an from the lungs. See more
Nasal fossa - Visual Dictionary - Copyright © 200 ...