Scientists model landscape formation on Titan, revealing an Earth-like alien world theAGU
over time, moving through winds and streams to be deposited in layers of sediments that eventually—with the help of pressure, groundwater, and sometimes heat—turn back into rocks. Those rocks then continue through the erosion process and the materials are recycled through Earth's layers over geologic time.
"As winds transport grains, the grains collide with each other and with the surface. These collisions tend to decrease What makes ooids unique is their formation through chemical precipitation, which allows ooids to grow, while the simultaneous process of erosion slows the growth as the grains are smashed into each other by waves and storms. These two competing mechanisms balance each other out through time to form a constant grain size—a process the researchers suggest could also be happening on Titan.
Atmospheric modeling and data from the Cassini mission reveal that winds are common near the equator, supporting the idea that less sintering and therefore fine sand grains could be created there—a critical component of dunes. The study authors predict a lull in sediment transport at mid-latitudes on either side of the equator, where sintering could dominate and create coarser and coarser grains, eventually turning into bedrock that makes up Titan's plains.
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