Question

what are tornado shelters​

Answer 1

It can be an underground or above the ground shelter that protects people from calamities like tornados and storms.

Answer 2

A tornado is a dark funnel shaped cloud that reaches from the sky to the ground. A violent tornado can travel at speeds of about 300 km/hr.  A tornado shelter is room situated deep inside or underground having no windows. Otherwise it is better  to shut the windows and take shelter under a table. One has to low down on knees, protecting the head  and neck using arms.