How To Date A Planet
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The moon is old - at least, it looks old, since its entire surface is strewn with the rubble of broken down rock and pockmarked with scars from ancient asteroid impacts. We know that rocks weather here on Earth too, and that meteorites have made some considerable dents over the years, but today Earth looks reasonably fresh and new without widespread craters. Earth owes its youthful appearance to the fact that its outermost layer is constantly renewing itself - hiding its age. New rock spills onto the planet's surface from the mouths of volcanoes; magma is released at the seams of ocean floors and cools to become part of those floors; rocks metamorphose (and mountains form) when continents collide; and the sea floor is recycled as continents ride o...
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The moon is old - at least, it looks old, since its entire surface is strewn with the rubble of broken down rock and pockmarked with scars from ancient asteroid impacts. We know that rocks weather here on Earth too, and that meteorites have made some considerable dents over the years, but today Earth looks reasonably fresh and new without widespread craters. Earth owes its youthful appearance to the fact that its outermost layer is constantly renewing itself - hiding its age. New rock spills onto the planet's surface from the mouths of volcanoes; magma is released at the seams of ocean floors and cools to become part of those floors; rocks metamorphose (and mountains form) when continents collide; and the sea floor is recycled as continents ride o...
