Superposition is the geologic principle which explains why the bottom stratum in a section of rock is the oldest. The word literally means placing one thing on top of another where the lower strata are the older.
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In 2019, Australia exported a total of $284B, making it the number 19 exporter in the world. ... The most recent exports are led by Iron Ore $67.5B, Coal Briquettes $51.5B, Petroleum Gas $34.1B, Gold $25.4B, and Aluminium Oxide $5.6B
It is called a drainage basin
