Volcanoes today are the result of gases that were trapped in Earth's interior during the planet's early stages of formation.

今天的火山是由地球形成早期被困在地球内部的气体所形成的。

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The rock material flows up from Earth's interior here, at the split, which forces the two sides of the ocean floor to spread apart, to make room for the new rock material.

岩石物质从地球内部的裂缝处向上流动，迫使海底向两边分开，为新的岩石物质腾出空间。

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He discussed the propagation of waves through the earth's interior.

他探讨了地震波在地球内部的传播。

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Those created in the atmosphere on the other side of the world, which then had to make the 20, 000km (12, 000 mile) journey through the earth's interior to get to Japan, would have had a chance to turn their coats.

ECONOMIST: Neutrinos

Here's one example why we should care: in 1977, diving in the human occupied vehicle Alvin, scientists investigating a volcanic ridge 2500 m (1.5 miles) below sea-level found something totally unexpected -- lush ecosystems thriving at hydrothermal vents fueled by chemical energy released from the Earth's interior.

CNN: Probing the ocean's undiscovered depths

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.

CNN: Probing the ocean's undiscovered depths