Could it possible be the mobile chip?
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i believe the answer is either a or b :)
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All lakes fill bowl-shaped depressions in the Earth's surface, called basins. ... When the glaciers melted, water filled those depressions, forming lakes. Glaciers also carved deep valleys and deposited large quantities of earth, pebbles, and boulders as they melted.
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The Indian Removal Act was signed into law by President Andrew Jackson on May 28, 1830, authorizing the president to grant lands west of the Mississippi in exchange for Indian lands within existing state borders. A few tribes went peacefully, but many resisted the relocation policy
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Great Britain’s coal resources come from sediments from the Carboniferous age – 300 million years ago-, which rotted under anoxic conditions of sands, silts and mudstones and extend under the North Sea and onshore lands of Northumberland, Durham, North and South Wales, Yorshire, East and West Midlands, Kent, Lancashire and the Scottish Centrl Belt. It took more than ten thousand years to the peat for reaching a thickness of ten metres, enough to make about one metre of coal under the increasing pressure of sediments. Mostly, minig settls in the 1700s were carved, structured with tree trunks and branches and covered with bricks unto 150 foot depth. People always worked there in terrible conditions, including women and children.