1
GEO 401: Test 3 Review (Dr.Befus)
Questions and Answers (100%
Correct Answers) Already Graded A+
Earth's Origin Ans: Gravitational collapse forming
differentiated layers.
© 2026 Assignment
Earth Structure by Composition Ans: Crust, mantle, and core
based on elemental makeup.
Guru01 - Stuvia
Expert
Continental Crust Ans: Thicker, granite-rich crust (~30 km).
Oceanic Crust Ans: Thinner, basalt-rich crust (~7 km).
Mohorovicic Discontinuity Ans: Boundary between crust and
mantle.
Mantle Ans: Peridotite-rich layer beneath the crust.
Core Ans: Metallic Fe-Ni composition.
Meteorite Proxy Ans: Analog for Earth's core composition.
Xenolith Sampling Ans: Mantle fragments brought to the
surface by magma.
Earth Density Profile Ans: Density increases with depth,
inferred from seismic data.
, 2
Seismic Wave Speed and Rock Type Ans: Wave speeds reveal
rock compositions.
Lithosphere Ans: Rigid outer shell of Earth.
Asthenosphere Ans: Viscous, deformable upper mantle layer.
Lower Mantle Ans: Strong, uniform layer.
Liquid Outer Core Ans: Generates magnetic field.
© 2026 Assignment
Solid Inner Core Ans: Dense Fe-Ni metal.
Guru01 - Stuvia
Expert
Isostasy Ans: Lithosphere floats on the asthenosphere.
S-wave Paths Ans: Curved paths indicating solid layers.
P-wave Paths Ans: Travel through all layers, including liquids.
Shadow Zone Ans: Region where no seismic waves are
detected.
Magnetic Field Ans: Generated by outer core motion.
Phase Diagram for Iron Ans: Supports solid inner core
composition.
Plate Tectonics Ans: Lithospheric plates move and interact.
Divergent Boundaries Ans: Plates pull apart, forming rifts and
ridges.
Continental Rifts Ans: Divergent boundaries on land.
GEO 401: Test 3 Review (Dr.Befus)
Questions and Answers (100%
Correct Answers) Already Graded A+
Earth's Origin Ans: Gravitational collapse forming
differentiated layers.
© 2026 Assignment
Earth Structure by Composition Ans: Crust, mantle, and core
based on elemental makeup.
Guru01 - Stuvia
Expert
Continental Crust Ans: Thicker, granite-rich crust (~30 km).
Oceanic Crust Ans: Thinner, basalt-rich crust (~7 km).
Mohorovicic Discontinuity Ans: Boundary between crust and
mantle.
Mantle Ans: Peridotite-rich layer beneath the crust.
Core Ans: Metallic Fe-Ni composition.
Meteorite Proxy Ans: Analog for Earth's core composition.
Xenolith Sampling Ans: Mantle fragments brought to the
surface by magma.
Earth Density Profile Ans: Density increases with depth,
inferred from seismic data.
, 2
Seismic Wave Speed and Rock Type Ans: Wave speeds reveal
rock compositions.
Lithosphere Ans: Rigid outer shell of Earth.
Asthenosphere Ans: Viscous, deformable upper mantle layer.
Lower Mantle Ans: Strong, uniform layer.
Liquid Outer Core Ans: Generates magnetic field.
© 2026 Assignment
Solid Inner Core Ans: Dense Fe-Ni metal.
Guru01 - Stuvia
Expert
Isostasy Ans: Lithosphere floats on the asthenosphere.
S-wave Paths Ans: Curved paths indicating solid layers.
P-wave Paths Ans: Travel through all layers, including liquids.
Shadow Zone Ans: Region where no seismic waves are
detected.
Magnetic Field Ans: Generated by outer core motion.
Phase Diagram for Iron Ans: Supports solid inner core
composition.
Plate Tectonics Ans: Lithospheric plates move and interact.
Divergent Boundaries Ans: Plates pull apart, forming rifts and
ridges.
Continental Rifts Ans: Divergent boundaries on land.
