Detailed studies of the surface indicate that these were formed by a lake caused by the flow of underground water that periodically made its way to the bottom of the crater.
FORBES: NASA Finds Remains Of Ancient Martian Lake
Traffic will flow through high-speed underground roadways and aboveground interchanges.
FORBES: American Pyramids
Most of those chemicals are designed to stay underground, where they react with the rock and help the oil and gas flow.
FORBES: Shale Gas Frackers Get Excited About ... A New Sponge?
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