sharp crest in a sentence

1. This contrasts with non-linear surface gravity waves, which have sharp crests and flat troughs.
2. South of these the mountains are marked by steep northwest sides, sharp crests and gently sloping southeast sides.
3. The highlands, characterized by steep slopes, sharp crests, and narrow valleys, are covered mainly by a dense broadleaf evergreen forest.
4. The anterior set passes obliquely superiorly and laterally from the sharp crest on the superior border of the neck of each rib to the anterior surface of the transverse process of the vertebra immediately superior to it.
5. It's difficult to find sharp crest in a sentence.