Meaning: The shells are making a loud sound as you walk on them.
Choice of Words: Shells are the hard outer coverings of some sea creatures. Crunch means to make a loud, crackling sound when you step on something. Underfoot means below your feet.
Alternative Expressions
The shells make a crunching noise when I step on them.
Meaning: This sentence describes the sound that seashells make when you step on them. It means that the shells are breaking and making a crunching noise as you walk on them.
Choice of Words: The shells are the hard outer coverings of some animals, like snails and clams. Make means to create or produce something. Crunching means to make a loud, crackling sound when you step on something hard. When you put them together, "The shells make a crunching noise" means that the shells are creating a crackling sound when you step on them.
I hear a crunching sound when I walk on the shells.
Meaning: This sentence describes the sound that you hear when you step on seashells. It means that you are hearing a crackling sound when you walk on the shells.
Choice of Words: Hear means to perceive sound with your ears. Crunching means to make a loud, crackling sound when you step on something hard. When you put them together, "I hear a crunching sound" means that you are perceiving a crackling sound with your ears.