Fifteen years ago, my Contractor used unwanted river gravelly sand from Sarawak River to fill up my backyard by 1.5m high.
Today, I find these gravels lovely and beautiful.
Each of these gravels has long history to tell. Where were they from?
What are they made up of? Why are they coloured? How old are they?
Of course, every thing on Earth is made up of star dust, including you and me. But how did they come about would need you to understand geology or even astronomical physics. If you are a civil engineer, you better know it as it is an interesting subject!
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