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World map with the middle latitudes highlighted in red Extratropical cyclone formation areas. The middle latitudes, also called the mid-latitudes (sometimes spelled midlatitudes) or moderate latitudes, are spatial regions on either hemisphere of Earth, located between the Tropic of Cancer (latitude 23°26′09.7″) and the Arctic Circle (66°33′50.3″) in the northern hemisphere and ...
About 35 million years ago, a volcanic arc grew across this complex mosaic of old terranes. Volcanoes erupted to cover the older rocks with lava and ash. Large masses of molten rock invaded the older rocks from below. The volcanic arc is still active today, decorating the skyline with the cones of Mount Baker and Glacier Peak. [12]
A volcanic arc (also known as a magmatic arc [1]: 6.2 ) is a belt of volcanoes formed above a subducting oceanic tectonic plate, [2] with the belt arranged in an arc shape as seen from above. Volcanic arcs typically parallel an oceanic trench , with the arc located further from the subducting plate than the trench.
Middle America is a subregion in the middle latitudes of the Americas.It usually includes Mexico, the seven countries of Central America, and the 13 island countries and 18 territories of the Caribbean.
The different volcanic zones are intercalated by volcanic gaps, zones that, despite lying at the right distance from an oceanic trench, lack volcanic activity. [13] The Andes has three major volcanic gaps the Peruvian flat-slab segment (3 °S–15 °S), the Pampean flat-slab segment (27 °S–33 °S) and the Patagonian Volcanic Gap (46 °S–49 ...
Mazama Ash had a minimum fallout area of 350,000 square miles (900,000 km 2), while ash from northwestern Washington's Glacier Peak volcano, known as Glacier Peak Ash, encompassed an area of more than 100,000 square miles (260,000 km 2). Mazama Ash is found at a higher layer than the Glacier Peak ash, estimated to have deposited over 13,000 ...
Within regions of volcanic activity, volcanic fields are clusters of volcanoes that share a common magma source. [3] Unlike a large volcano with satellite or subsidiary vents, a volcanic field's vents have their own source of magma, possibly of different compositions (such as basalt and rhyolite ), and these vents may span an area of thousands ...
An example of a subduction-zone related volcanic belt is the Okhotsk-Chukotka Volcanic Belt in northeastern Eurasia, which is one of the largest subduction-zone related volcanic provinces in the world, stretching some 3,200 kilometres (2,000 mi) and comprising about 2 × 10 6 cubic kilometres (4.8 × 10 5 cu mi) of volcanic and plutonic material.