Instead, they packed the earth, which is rich in clay, into thick walls that provided insulation from the hot summers and cold winters.
Explanation:
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It is expected that seafloor samples taken farther from land usually contain a greater proportion of biogenous sediments because sediments are thinnest on the seabed closest to spreading centres (young seafloor) and thicker distant from the ridge (older seafloor with more time for accumulation). Additionally, sediments are substantially thicker close to continents.
More about seafloor sediments:
Terrigenous, pelagic, and hydrogenous sediment are the three different types of sea floor sediment. Terrigenous sediment is deposited on the continental shelf, continental rise, and abyssal plain and is derived from the land.
Clay particles and tiny marine animal skeletons that progressively sink to the ocean floor make up pelagic sediment. Minerals that precipitate from seawater on the ocean floor, such as manganese nodules, are abundant in hydrogenous sediments.
Learn more about sediments here:
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The Persian Gulf lies east of the Arabian Peninsula. It also lies between modern Iraq. Hope this helps! :)
<span>The Ming dynasty created and expanded trade networks across Asia</span>