Asked by dom
shortly say evidence abot topography of the seafloor
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Brief evidence about seafloor topography:
- Direct mapping: echo-sounding and multibeam sonar produce detailed bathymetric maps showing mid-ocean ridges, trenches, abyssal plains, seamounts and fracture zones.
- Satellite altimetry: gravity anomalies from satellites reveal large-scale seafloor shape where ship data are sparse.
- Seismic reflection/refraction: profiles show sediment layers, crustal structure and basin depths.
- Rock samples & drilling: dredged basalts at ridges and sediments in basins confirm crust types and ages.
- Magnetic stripes and age patterns: symmetric magnetic anomalies and radiometric ages increase with distance from ridges, supporting seafloor spreading.
- Heat flow and earthquakes: high heat flow at ridges, deep earthquakes at trenches match plate boundary processes.
- Direct mapping: echo-sounding and multibeam sonar produce detailed bathymetric maps showing mid-ocean ridges, trenches, abyssal plains, seamounts and fracture zones.
- Satellite altimetry: gravity anomalies from satellites reveal large-scale seafloor shape where ship data are sparse.
- Seismic reflection/refraction: profiles show sediment layers, crustal structure and basin depths.
- Rock samples & drilling: dredged basalts at ridges and sediments in basins confirm crust types and ages.
- Magnetic stripes and age patterns: symmetric magnetic anomalies and radiometric ages increase with distance from ridges, supporting seafloor spreading.
- Heat flow and earthquakes: high heat flow at ridges, deep earthquakes at trenches match plate boundary processes.
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