Aurally, when you stomp on the gas, you hear something like the rumble of approaching thunder, a deep-earth vibration that gives way to a high-pitched whir of motor and turbo.
These unsung passages function as the smaller veins feeding into the main artery of the Grand Canyon, the up-to-18-mile-wide, mile-deep gash in the earth through which 227 miles of the Colorado River snakes.
Scientists have found creatures thriving in places that would poison or cook most life on earth--deep inside rock, under the ocean or in hot springs, places that are extremely salty, or acidic, or bathed in radiation or heavy metals.
It comes from a garden wholesaler, which provides the high quality soil, taken deep beneath the earth's surface -- 10 meters down, in fact.
On Earth, sea-floor spreading is fuelled by molten rock upwelling from deep inside the Earth.
Given all the discoveries that we have made from an up-close investigation of these ocean ridges, we can't help but wonder what we might find at the far end of the same plate tectonic cycle where seafloor is drawn back into the Earth's interior at deep-ocean trenches.
Why on earth in this day of deep relational databases and high-speed international computer networks do we need printed passports?
FORBES: One man, 8 Reps, 466 miles, 1 iPhone, $400 = 1 U.S. Passport
Since Russia and the U.S. signed a partial test-ban treaty in 1963, their blasts have been deep below the earth's surface.
That was as deep as one could look into the earth with the available geological tools--and also about as far into the ground as anyone knew how to drill a well and push pipe into the hole.
These organisms, which have fundamentally different metabolisms to normal microbes, are found in hydrothermal vents on the deep-ocean floor and in rocks and springs hundreds of metres below the surface of the Earth.
BBC: NEWS | Science/Nature | Antarctica's resources 'at risk'
Earth resources: next to turbidite systems, also contourites may generate well-sorted deep-water sands.
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