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Mt st helens radiometric dating

Most of them cluster around the intersection of these two profound lineaments, both which almost certainly cut the full thickness of the lithosphere.

This telling elevation distribution reflects a powerful synergy between truly ancient plate processes driven by the cooling of the earth in the presence of gravity and ongoing mantle processes driven by Lord knows what.

The entire Mesozoic Era (295 Ma long) shot by in under an hour, the dinosaurs departed just 20 minutes ago (thank goodness), and we've been comfy and relatively ice-free for only a mere 0.2 seconds.

A healthy human female can expect to live just under 2 milliseconds in a developed country.

Given enough time, cold surface rock will yield to flowing water and buried rock will bend or even flow rather than break.

The planet's had ample time for all of this, even if it's out of our ken.

Geologic understanding requires careful attention to time as well as three-dimensional space, so we'd better stop here first.

If you're unfamiliar with geologic time terminology and abbreviations, take that detour now.

With the formation of the earth pegged at h (midnight), our work day finishes at h, just as we pull up to the present. Each hour corresponds to 0.875 billion years (Ga), each minute to 3.125 million years (Ma) and each second to 52.1 thousand years (Ka).

Conversely, 1 Ga takes 4 hours, 20 minutes out of the day; 1 Ma, 19.2 seconds; and 1 Ka, 19.2 millisecondsliterally the blink of an eye.

The table below collects the links to these headers.

Notice how even deep time can fly in proper perspective: The Precambrian was admittedly a slow start, taking until mid-evening to unfold on our day of creation, but then life as we know it appeared only in the last 3 hours.

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