If you look around you, you can find sand very easily. 你若环顾四周，就很容易发现沙子。

Sand comes from rocks. 沙子源自岩石。

Each grain of sand is less than 2 millimeters in diameter. 每粒沙子的直径小于两毫米。

Some smaller sand feels like flour. 有些更小的沙子看起来像面粉。

There are many different colors of sand. 沙子的颜色多种多样。

Some sand is white, and it can be found in tropical areas. 有的沙子是白色的，可以在热带地区找到。

Some sand is black, and it can be found in volcanic areas. 有的沙子是黑色的，可以在火山地区找到。

Also, some sand is green, and some sand is yellow. 还有的沙子是绿色和黄色的。