Stalactite and stalagmite landforms are formed by-

Correct answer: (b) By underground water

Explanation

Stalactite and stalagmite landforms are formed by underground water. Stalactites are hanging, icicle-like pillars of varying thickness. Generally, they occur near the base or near the roof of a cave and become thinner towards the tip. They appear in many shapes. Stalagmites grow upward from the cave floor. In fact, stalagmites are formed by lime-mixed water dripping from the cave roof onto the ground, or they form in the shape of thin pipes directly below stalactites.