You might find it on a beach thousands of miles from where it started, but sand can record the rise and fall of mountains that vanished millions of years ago.
, at least in the Earth sciences. For something to be sand, it has to be between 0.063 and 2 millimetres in diameter. Anything smaller is mud, anything larger is gravel, cobbles or boulders. Sometimes sand is all you will find, like in a desert. Sometimes that sand is mixed with pieces of varying sizes, like on a bar along a river.that are important for understanding the source of the sand and what happened in its journey to where it was deposited.
So, if you start with a big mountain range like the Andes, all the processes of weathering and erosion will break those monoliths down into tiny fragments by the time they are deposited in the sea. Mighty rivers like the Amazon carry all the debris from the mountains down to the oceans and with it, the record of pinnacles since destroyed.The Rise and Fall of the Andesexamined just what the record might be from the Amazon.
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