J
JonClarke
Guest
<i>So, are they supposed or are they real?</i><br /><br />I and very certain that these are lava caves.<br /><br />1)They are on the flanks of a young volcano, where you would expect caves.<br /><br />2) They are deep holes, like a cave would be.<br /><br />3) They are cool during the day and warm a night, just like a cave.<br /><br />4) They form chains down slope, just like caves would.<br /><br />5) A volcanic or hydrothermal vent would have built up deposits and not be as deep.<br /><br />6) Impact craters would have ejecta, and not be as deep.<br /><br />7) Solution collpase caves are unlikely because they require soluble rock (and liquid water) - both unlikely here.<br /><br />You are welcome to come up with a better explanation that fits the evidence.<br /><br />Jon <div class="Discussion_UserSignature"> <p><em>Whether we become a multi-planet species with unlimited horizons, or are forever confined to Earth will be decided in the twenty-first century amid the vast plains, rugged canyons and lofty mountains of Mars</em> Arthur Clarke</p> </div>