The Ancient Earth 4.  Where did all that water come from?

The oceans cover 71% of our planet, and account for 97% of its total surface water.  The greatest ocean depth is 10,994m in the Mariana Trench (near the Island of Guam), and the shallowest …, well most of you have been to the beach.   They harbour a massive biomass (micro and macro) that comprises beautiful and complex ecosystems; they help feed our burgeoning population.  They provide opportunities for explorers and metaphors for poets.  But where did all that water come from? Continue reading →