Mapping of the ocean floor

Nodules can be linked with mineral resources and slow deep-sea deposition. Exam tip: write both resource and environmental importance.

Sonar shows form and dredging confirms material. Exam tip: distinguish indirect image and direct sample.

Such vehicles can carry cameras and tools for targeted study at depth. Exam tip: treat them as direct observation technology.

A stable and safe floor must be identified for cable routes. Exam tip: connect mapping with safety of marine infrastructure.

Submarine landslides can displace water and increase hazard risk. Exam tip: link slope instability with risk.

Exaggeration improves visual clarity but changes apparent proportions. Exam tip: check scale while reading profiles.

A large grid size can make small highs and canyons less clear. Exam tip: remember the relation between resolution and grid size.

Repeated surveys can detect abnormal or wrong measurements. Exam tip: value reliability of scientific data.

These clues are linked with formation of new oceanic crust. Exam tip: identify the location by combining several evidences.

The pair of island arc and trench is often linked with subduction. Exam tip: use this pair for identifying plate boundaries.

Symmetrical magnetic stripes and age sequence directly show spreading of oceanic crust. Exam tip: treat sea-floor evidence as more scientific.

Abyssal hills indicate small rises on otherwise flat plains. Exam tip: consider subtle relief important too.

A map is final processed data, so technical corrections and spacing can alter results. Exam tip: understand raw and processed data separately.

Older crust away from ridges can be cooler and more sedimented. Exam tip: link age, sediment and heat together.

Trenches indicate active plate processes along with depth. Exam tip: connect landform with process.

A navigation chart and a scientific bathymetric map can both show water depths, but they are prepared mainly for different purposes. A navigation chart is designed to help ships travel safely. It emphasizes routes, hazards, channels, shallow areas, and other information needed for movement at sea. A scientific bathymetric map focuses on the shape and relief of the seafloor and may help researchers understand underwater landforms and geological processes. Therefore, option A is correct.

The distinction is based on use, not simply on whether depth is shown. A scientific map may include detailed depth measurements, while a navigation chart may simplify or highlight information that is important for safe travel. The options saying that both maps only write poems, that one measures crustal age, or that a scientific map has no depths are clearly incorrect. Thus, safe routing belongs primarily to navigation charts, whereas scientific interpretation belongs primarily to bathymetric maps.

A wide shelf and land-derived sediments can be common signs of a passive margin. Exam tip: link sedimentation with margin type.

At active margins, trench and steep slope may be linked with subduction. Exam tip: connect a narrow profile with active boundary.

Tide and water-level changes affect depth reference. Exam tip: remember reference level for charted depth.

Outer beams in multibeam systems travel obliquely, so geometric correction is needed. Exam tip: treat positional accuracy as important as depth.

Side-scan sonar is useful for imaging floor texture and patterns. Exam tip: identify it as a floor-imaging method.

Such deposits indicate both resources and ridge activity. Exam tip: write economic and scientific importance together.

Different data together clarify both landform and process. Exam tip: make multi-evidence analysis an expert answer.

Sea-floor evidence connected continental drift with plate tectonics. Exam tip: write later evidences systematically.

Ocean-floor mapping is useful in both scientific and practical fields. Exam tip: write its multidimensional importance in a balanced way.