Study Tip
Clast- is a Greek root that means broken. Clastic rocks are rocks that are formed from broken pieces of rock. Other words with this root: Iconoclast: a breaker of beliefs or traditional institutions; osteoclast: A cell breaks up organic bone.
Study Tip
The same way a person may cast a shadow over another person when they stand under the sun, planets or celestial bodies that have aligned themselves cast shadows over one another as well.