3 sentences

1. 地壳是地球最外层的固体部分。

   dì qiào shì dì​qiú zuì wài​céng de gù​tǐ bù​fen.

   The Earth's crust is the outermost solid part of the Earth.

   Source: Dong Chinese Dictionary

2. 这种固体被研磨成了细小的粉末。

   zhè zhǒng gù​tǐ bèi yán​mó chéng le xì​xiǎo de fěn​mò.

   This solid has been ground into a fine powder.

   Source: Dong Chinese Dictionary

3. 这种物质受热以后，会慢慢从固体变成透明的液体。

   zhè zhǒng wù​zhì shòu​rè yǐ​hòu, huì màn​màn cóng gù​tǐ biàn​chéng tòu​míng de yè​tǐ.

   When heated, this substance gradually changes from a solid into a transparent liquid.

   Source: Dong Chinese Dictionary