तड़ित (lightning) या बिजली गिरने के समय निम्नलिखित में से कौन सा स्थान सबसे सुरक्षित होता है?

How do tornadoes typically extend and touch the ground?

The place inside the earth's crust where an earthquake originates is called the:

A seismograph is an instrument used to detect and record the vibrations of earthquakes. Which of the following is a primary internal component of a basic mechanical seismograph?