stalagmitean upward-growing mound on the floor of a cave formed by dripping mineral-rich waterOver thousands of years, a stalagmite can grow tall enough to meet a formation hanging from above.NoteOver thousands of years, a stalagmite can grow tall enough to meet a formation hanging from above.Elon.io is an online learning platformWe have an entire course teaching TOEFL Academic Vocabulary grammar and vocabulary.Start learning TOEFL Academic Vocabulary now