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List of national parks of the United States

The United States has 62 protected areas known as national parks that are operated by the National Park Service, an agency of the Department of the Interior. National parks must be established by an act of the United States Congress. A bill creating the first national park, was signed into law by President Ulysses S. Grant in 1872, followed by Mackinac National Park in 1875, Rock Creek Park and Yosemite in 1890; the Organic Act of 1916 created the National Park Service "to conserve the scenery and the natural and historic objects and wildlife therein, to provide for the enjoyment of the same in such manner and by such means as will leave them unimpaired for the enjoyment of future generations." Many current national parks had been protected as national monuments by the president under the Antiquities Act before being upgraded by Congress. Seven national parks are paired with a national preserve, areas with different levels of protection that are administered together but considered separate units and whose areas are not included in the figures below.

Criteria for the selection of national parks include natural beauty, unique geological features, unusual ecosystems, recreational opportunities. National monuments, on the other hand, are chosen for their historical or archaeological significance. Fourteen national parks are designated UNESCO World Heritage Sites, while 21 national parks are designated UNESCO Biosphere Reserves. Eight national parks are designated in both UNESCO programs. Twenty-nine states have national parks, as do the territories of American Samoa and the U. S. Virgin Islands. California has the most with nine, followed by Alaska with eight, Utah with five, Colorado with four; the largest national park is Wrangell–St. Elias in Alaska: at over 8 million acres, it is larger than each of the nine smallest states; the next three largest parks are in Alaska. The smallest park is Gateway Arch National Park, Missouri, at 192.83 acres. The total area protected by national parks is 52.2 million acres, for an average of 870 thousand acres but a median of only 229 thousand acres.

The national parks set a visitation record in 2017, with more than 84 million visitors and set a further record in 2018 with a 0.1% increase. The most-visited national park is Great Smoky Mountains National Park in North Carolina and Tennessee, with over 11.3 million visitors in 2017, followed by Arizona's Grand Canyon National Park, with over 6.2 million. In contrast, only 11,177 people visited the remote Gates of the Arctic National Park and Preserve in Alaska in the same year. A few former national parks have been disbanded. Other units of the National Park Service while broadly referred to as national parks within the National Park System do not hold the formal designation in their title. National Park Service History of the National Park Service List of areas in the United States National Park System List of the United States National Park System official units List of National Monuments of the United States List of U. S. National Forests List of World Heritage Sites in the United States Official website of the National Park Service Find a park Visitor use statistics The National Parks: America's Best Idea by PBS America's Natural Heritage - The Essential Guide to the National Parks by The Washington Post Interactive map at

Tickle Me (EP)

Tickle Me Vol. 1 and Tickle Me Vol. 2 are the eighth and ninth extended plays by Elvis Presley, Containing songs from the motion picture of the same name. They were released by RCA Victor in 1965. For the first time in his career, the budget did not allow new songs to be commissioned for a Presley film; the soundtrack was assembled from released recordings, recycling nine songs in total with some dating back to recording sessions from 1960. All songs were taken, as pressed, from released albums but a new vocal was recorded for "I Feel That I've Known You Forever", a harmony vocal and narration was removed on "I'm Yours". Four of the songs were released on singles, with the other five on an extended play single as the official soundtrack. " Easy Question," by Otis Blackwell and Winfield Scott, was paired with "It Feels So Right" by Fred Wise and Ben Weisman. Released on Pot Luck with Elvis and Elvis Is Back! they were reissued as catalogue 47-8585 in June 1965, with the A-side "Easy Question" going to #11 on the Billboard Hot 100 and the B-side peaking at #55 independently.

A second pairing, "I'm Yours" by Don Robertson and Hal Blair from Pot Luck with " Long Lonely Highway" by Doc Pomus and Mort Shuman from Kissin' Cousins, were reissued as the A and b sides of catalogue item 47-8657 in August 1965, "I'm Yours" peaking on the chart at #11. "I'm Yours" was released on 45 rpm as presented on film and the flip side was the movie opening number " Long, Lonely Highway", but in an alternate take. The soundtrack EP was issued in June 1965 containing the other five songs, it only reached #70 on the singles chart, another indication of format's lack of appeal by the mid-1960s, although the fact its contents featured songs that were available on various still-in-catalog albums may have played a role. RCA would only issue one more extended play single for Presley in 1967, and with Beatlemania and the British Invasion in full swing, the music was stagnant. In the UK, a Tickle Me Vol. 2 EP was issued containing the four tracks released on singles in the US. In the 1960s, to obtain all nine songs in long-playing format, one would have to acquire Elvis Is Back!, Something for Everybody, Pot Luck, the Fun in Acapulco and Kissin' Cousins soundtracks.

In 2005, Sony Music issued a compact disc soundtrack of Tickle Me on their specialty Presley-oriented collectors label, Follow That Dream. It featured the film's nine songs along with five bonus tracks. Tickle Me was reissued on the Follow That Dream label in 2005 in a deluxe 2-disc CD collection containing the original Extended Play along with numerous alternate takes from the original recording sessions. Elvis Presley – vocals.

Sumatra Trench

The Sumatra Trench belongs to the Sunda Trench or Java Trench. The Sunda subduction zone is located in the east part of Indian Ocean, is about 300 km from the southwest coast of Sumatra and Java islands, it extends over 5000 km long, starting from Burma in the northwest and ending at Sumba Island in the southeast. The Java trench was generated by the oblique subduction of the Indo-Australian Plate into the Sunda plate at a rate of 61mm/y and 51mm/y; the oceanic crust being subducted via this accretionary margin has variable ages and structure along the trench. There is research showing that arc parallel dextral strike-slip fault systems developed on the landward side of the Sunda forearc to absorb part of the dextral motions associated with the oblique plate convergence. After the disastrous 2004 Sumatran tsunami and more researchers begin to study this area; the trench slope is now being considered as a result of folds and faults in the area which were originated from the local seafloor deformation.

Seismic profiles at Sumatra Trench shows that, the down-going Indo-Australian plate has its slip vectors rotate to a NE direction. This indicates that the plate motion is dominated by the dextral shear inside the Indo-Australian Plate in the order of 3.6–4.9 cm/yr. Transpressive deformation of the subducting plate edge is the primary to absorb the shear force. At the southeast section of this area, the Sumatra fault zone bends towards south and merges into the extensional south striking fault system of the Sumatra trait; the Sumatra Trench near the northwestern and western parts of Sumatra are defined as a high hazard region where 6.0 and 7.0 Mw magnitude earthquakes can generate quite i.e. every 6–12 and 10–30 years, respectively. The Sumatra Fault Zone is the most worth noting area on the Eurasian plate near Sumatra trench. Within the Sumatra Fault Zone lies the majority of the right-lateral stress from the relative motion between the Indo-Australian and Eurasian plates; the Sumatra Fault Zone meets the south trending extensional faulting system in Sunda Strait in Semangka.

The materials from the fault zone can generate submarine pull-apart grabens. In the convergent margins where accretion plays an important role, prism width varies from 40 km to 350 km; the width at Sumatra trench is controlled by history. One distinguishing feature of the Sumatra subduction zone is that it has a 120–140 km accretionary prism and a deep forearc basin; however it does vary along the trench. The prism is broad and has a shallow surface slope in the northern part, becomes steep and narrow at the central part becomes steep and narrow in the southern area; the inner part of the prism forms a NW-SE arc ridge offshore Sumatra with Enggano Islands being its highest point. This arc ridge has the widths of 30–60 km and is made up of 5 to 6 southward thrusting imbricated flakes; the flakes can be noticed due to their distinctive characteristics such as morphology, turn-overs and size. A distinctive strip-thrust fold locates on the western boundary of the accretionary wedge occurs on south of Enggano Island.

A deformed and thin sedimentary layer covers all the subsurface areas. The scarce but still existing missing of part of the arc ridge offshore is result from extensional tectonic activities together with compression partitioning. All the basement can be realized based on strong multiple reflections from the seafloor except some places in the north part because of the existing of some down faulted continental blocks. There is a main normal fault correlated along the Sumatra region. Offshore Sumatra continental basement underlies the seaward propagating wedges; the basin in southern Sumatra is influenced by anticlines and fault zones. The North Sumatra region is defined here as the segment between 2.4–6°N. Accretionary wedges and forearcs here are broad. A steep toe presents. Average accretionary wedge has a width about 155–163 km, the forearc basin has about 100–140 km thickness. Superficial average slope is about 1.2–1.3° while the outer part becomes steeper compare to the rest. Landward vergence of thrust folds frontal fold vergence is the most ubiquitous tectonic event happens at the prism bottom.

Several landward vergences have been transformed into seaward. Seaward vergence is common further into the prism; the unusual structure here results in not only a strong wedge interior, but tendency of a duplex deformation. The central region is from 3°S–2°N in the area near Simeulue island; the prism narrows with the increasing of average surface slope. This is an indication of the existence of a transition zone between North and Central Sumatra regions. In the Central Sumatra region, a wide basement high, which has connections with the N-S trending fracture zone, is being subducted and causing the generation of variations in sediment thickness across the oceanic plate; the transition zone in the Central Sumatra region is defined as 2–2.5°N, based on the abruptly changes of structure and sediment changes. The structure and morphology begin to change at 2.4°N but the sediment thickness remains unchanged until 2°N. Prism width decreases from 150 km to 100 km over less than 100 km strike during the surface slope increases from 1° to 3°.

This region has variable oceanic plate sediment component and seafloor hardness. Because as it goes further and further from the Bengal Fan source, the ridge and basement structure together with