Word: trenched
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...Mariana Trench...
...three marine monuments will include the northern Marianas Islands and the Mariana Trench (the deepest point in the world), the Rose Atoll near American Samoa and several remote islands in the middle of the Pacific, including Wake Island. The monuments will be declared protected under the Antiquities Act, a 1906 law that gives the President the authority to restrict the use of public land owned by the Federal Government via executive order without consulting Congress. Initially designed to protect prehistoric Indian ruins in the American West from grave robbers, the law has been used more recently...
...marine monuments will comprise the ocean waters within a 50-nautical-mile radius of the protected islands and will safeguard virtually the whole of the Mariana Trench. Commercial fishing will be banned within the monuments, and mining, oil exploration and other commercial activity will be limited. (Sportfishing and other boating may be allowed within the region, but only on a permitted basis.) Those protections will shield the rich, pristine marine life found among the coral reefs of the central Pacific, which includes hundreds of species of rare birds and fish. Though most of the monument areas are so remote that...
...abundant in Martian seas, just as it is in Earth's. Opportunity discovered deposits of BB-sized pellets - which NASA nicknamed blueberries - that are rich in hematite, a mineral that forms only in watery environments. And by pure serendipity, in 2007 a balky wheel on Spirit dug a shallow trench in the ground, revealing the presence of white silica, another indicator of water. So far, neither rover has uncovered hard evidence of life, but by no means have they ruled it out either...
...announced the discovery of white silica beneath the Martian soil--a telltale mineral that usually forms in the presence of water--one more bit of proof that Mars was once a wet place. The silica would never have been discovered if Spirit's balky wheel hadn't dug a trench in the soil...