Particles are heated by the Sun. Particles are melted together by magma. Particles are compressed into layers. Particles are changed into liquids.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: There are several different types of rock. Each type of rock is formed under different conditions. How are sedimentary rocks, such as shale and sandstone, formed?
Possibilities:
- Particles are heated by the Sun.
- Particles are melted together by magma.
- Particles are compressed into layers.
- Particles are changed into liquids.

Particles are compressed into layers.