noun, の adjective
If sand makes a lot of profit, it swells up and becomes gravel. They're like the fat cats of the beach.
You learned the reading for 利 with the kanji, but the reading for 砂 is irregular, so here's a mnemonic to help you:
You're walking through that big fat gravel, when a pile of it starts moving, and something suddenly leaps out at you. It's a... jaguar (じゃ)! Run!
Asphalt is gravel that's hardened with petroleum.
The uranium mine is at the end of this gravel road.
I think it would be a shame to spread gravel over the garden when we could grow vegetables.