Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years. Mountains have been built and eroded, continents and oceans have moved ...
Geologic assessment of active tectonism depends on two key measures: the age and the amount of deformation of a given stratigraphic unit. The amount of deformation can normally be measured with ...
Paleolithic hunters built mammoth traps in what is now Mexico some 14,700 years ago. An unknown sea creature left footprints in sand some 550 million years ago, making them the oldest known footprints ...
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