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2. Hawaiian Trough - Wikipedia

   en.wikipedia.org/wiki/Hawaiian_Trough

   The Hawaiian Trough is about 18,045 feet (5,500 meters) deep and has a radius of about 8.7 miles (14.0 km). [2] The subsiding lithosphere is balanced out and through the concept of isostasy a part of the crust surrounding the trough is levered upwards creating the Hawaiian Arch.

3. Los Arcos National Marine Park - Wikipedia

   en.wikipedia.org/wiki/Los_Arcos_National_Marine_Park

   The three largest arches are named Roca de Los Arcos (The Rock of the Arches), Roca de la Tortuga (Turtle Rock), and Roca del Diablo (Devil's Rock). Devil's Rock is named so due to one of its cliffs' shadows looking similar to Satan. The waters around the park may be the deepest in the Bay of Banderas, going as deep as 480 metres (1,570 ft). [1]

4. Manganese nodule - Wikipedia

   en.wikipedia.org/wiki/Manganese_nodule

   Very little is known about deep sea ecosystems or the potential impacts of deep-sea mining. Polymetallic nodule fields are hotspots of abundance and diversity for a highly vulnerable abyssal fauna, much of which lives attached to nodules or in the sediment immediately beneath it.

5. Natural arch - Wikipedia

   en.wikipedia.org/wiki/Natural_arch

   A natural arch, natural bridge, or (less commonly) rock arch is a natural landform where an arch has formed with an opening underneath. Natural arches commonly form where inland cliffs , coastal cliffs , fins or stacks are subject to erosion from the sea, rivers or weathering ( subaerial processes).

6. Arch of Cabo San Lucas - Wikipedia

   en.wikipedia.org/wiki/Arch_of_Cabo_San_Lucas

   The arch is locally known as "El Arco," which means "the arch" in Spanish, or "Land's End." [2] It is here that the Pacific Ocean becomes the Gulf of California. This area is widely used in hotel advertising in the Los Cabos Corridor. This spot is a popular gathering area for sea lions and is frequented by tourists. [3]

7. Deep sea mining - Wikipedia

   en.wikipedia.org/wiki/Deep_sea_mining

   The United Nations Environment Programme (UNEP) emphasizes the need for a comprehensive assessment of the environmental impacts of deep-sea mining, which targets polymetallic nodules at depths of 3–6.5 km (1.9–4.0 mi), polymetallic sulphides at 1–4 km (0.62–2.5 mi), and cobalt-rich ferromanganese crusts between <400 m and 3.5 km ...