| Origin of Earth |
Formed from rocky debris in a solar nebula; grew by accretion |
Earth is the remains of a former star (or gas giant), having lost most of its mass |
| Mechanism for Crustal Movement |
Driven by mantle convection and lithospheric motion |
Driven by decompression and expansion due to loss of massive stellar atmosphere |
| Cause of Ocean Basins |
Formed by divergence at mid-ocean ridges and plate movement |
Formed as the Earth’s solid regions expanded, cracking the crust and exposing deep interior |
| Source of Geological Activity |
Subduction, rifting, volcanism due to internal heat and convection |
Stress fractures and outgassing during decompression after atmospheric loss |
| Atmosphere Origin |
Volcanic outgassing from rock |
Residual primordial gas from early stellar atmosphere; not outgassed, but retained |
| Fit of Continents |
Continental drift over a fixed-radius Earth |
Continents were once connected on a smaller solid core that expanded with decompression |
| Problem of Subduction |
Requires continuous recycling of crust via subduction zones |
Subduction is reinterpreted as gravitational settling of older crustal slabs—not true recycling |
| Energy Source |
Internal radioactive decay and thermal convection |
Gravitational potential energy released from decompression (as outer layers expand outward) |
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