Dendrite Crystal Portraits Size:Small 7 million square mile basin

7 million square mile basin (7 million square km) is home to the Amazon rainforest

" ~ René-Just Haüy

though their true origin is far older

best known for the Velociraptor

John Uri of the NASA Johnson Space Center posted this touching retrospective of the crew from STS-51L on the 35th anniversary of the disaster

Dendrite Crystal Portraits Size:Small 7 million square mile basinThough they may look like fossil plants, dendrites are incredible and inorganic formations that occur solely due to interactions between physics and geochemistry. These branching patterns are made of manganese oxides and commonly form on the surface of sandstones. As the manganese cools, it crystalizes into thin, tree like shapes in the same process that creates snowflakes. This specimen is a sandstone slab that has been imprinted with a manganese