1, white teeth are soft carbonates, and most carbonate minerals are colorless or white.
The white rock is next to the sea, which is eroded every year and soon disappears. The surface cannot be covered by vegetation for a long time, so every time I see the white cliff, it is as white as new. Donglongzhou is an island in Hongkong, China. Administratively, it belongs to Saigon District. The island covers an area of 2.42 square kilometers and is located in the south of Clear Water Bay and southeast of Xiaoxi Bay on Hong Kong Island.