San Bernardino Arrowhead

There is a famous landmark in the foothills of the San Bernardino mountains.  It is a Arrowhead that seems to be carved into the mountain.  What I think is weird is that it never goes away.  In any kind of weather, the Arrowhead remains. I decided to look this up and found out that some people might think this was carved by people and made my man but it is not.  It is considered a phenomenon and no one really knows why it remains.  The arrowhead is 1,375 feet in length and 449 feet wide.  The face if the arrowhead is made with light quartz and surrounded by white sage.



http://sbcity.org/about/history/the_arrowhead.asp

Lava

Lava is made of the elements silicon, oxygen, aluminum, iron, magnesium, calcium, sodium, potassium, phosphorus, and titanium (plus other elements in very small concentrations. A lava flow can move as far as 4 km from their source and have a thickness of 10 m if it has low silica content and low viscosities. These flows can move at rates of several km per hour. Lava flows that have more silica can move as far as 1.3 km from their source and have a thickness of 100 m and it travels at rates of a few hundred m per hour. If lava is traveling underground in lava tubes it can travel much farther.
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