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Stalagmite
Visual Imagery
Remember it as a might from the ground; visualizing its growth helps recall the word. 
Associated Words
Link 'stalagmite' with words like 'cave', 'dripping', 'calcium', and 'formation' to reinforce its meaning. 
Not Stalactite
Don't confuse it with 'stalactite, which hangs from the ceiling; stalagmite 'might' reach the ceiling from the floor. 