Stalagmites and stalactites are the depositional characteristic features of _______.

The correct answer is option 2, i.e Karst landforms.

Key Points

• Many depositional forms develop within the limestone caves.
• The chief chemical in limestone is calcium carbonate which is easily soluble in carbonated water (carbon dioxide absorbed rainwater).
• Stalagmites may take the shape of a column, a disc, with either a smooth, rounded bulging end or a miniature crater-like depression.
• Stalactites hang as icicles of different diameters. Normally they are broad at their bases and taper towards the free ends showing up in a variety of forms.