While we were talking the mighty iron mole had bored its way over a mile into the rock of the earth's crust.
We had turned in the ice and sped upward toward the earth's crust.
I ridiculed the assumption that there was an inner world and that these wires led downward through the earth's crust to the surface of Pellucidar.
The finding of the telegraph-instrument practically assured me that David Innes had driven Perry's iron mole back through the earth's crust to the buried world of Pellucidar; but what adventures had befallen him since his return?
The science of the earth's crust
-- to which, doubtless,
They had proceeded for a half or three-quarters of a mile when, at a turning of the gorge, Tarzan saw before him a narrow valley cut deep into the living rock of the earth's crust
, with lofty mountain ranges bounding it upon the south.
In the diagram, each horizontal line has hitherto been supposed to represent a thousand generations, but each may represent a million or hundred million generations, and likewise a section of the successive strata of the earth's crust
including extinct remains.
The geologist, who is fully impressed with the vast oscillations of level which have affected the earth's crust
within late periods, will not fear to speculate on the recent elevation of the Mexican platform, or, more probably, on the recent submergence of land in the West Indian Archipelago, as the cause of the present zoological separation of North and South America.
Over 90 percent of Earth's crust
- the thin outer layer of the planet - consists of silicate minerals.
But we have never drilled through Earth's crust
and into its interior.
Usually powerful earthquakes are accompanied with rapid increase in speed of vertical shift of Earth's crust
in epicenter and adjacent areas.
But while most associate the drought with impacts like dried-up lakes and a reduction in personal water use, a new study in Science spotlights a different--and surprising--result: Earth's crust
is physically rising due to the lack of water.