What makes sedimentary rocks red?

Answer 1

Well, sediment is usually a variety of things mixed together, like soil. In soil, you can see many different things, that's because sediment can contain things such as, dirt itself, leaves, dead organisms-such as plants and remains of animals (like if an animal was killed by another, the dead remains would decompose into small pieces). So, if sedimentary rocks (which basically is compacted soil/dirt) are red, it's something that got mixed into the sediment.

Answer 2

Sedimentary rocks can be red due to the presence of iron oxide minerals like hematite or limonite. These minerals give the rocks their distinct red color when they are deposited and compacted. Other factors such as the environment and conditions during deposition can also influence the color of sedimentary rocks.