Tectonophysics is a big word that means we study how the Earth's very outside layer, called the lithosphere, moves and changes over time. It's like the skin of an apple that can move around and change shape depending on what's happening inside.
Imagine you are playing with a ball of Play-Doh. If you press down on one side, the Play-Doh will move and change shape. This is kind of what happens with the Earth's lithosphere, except it's not just from us pressing down on it.
The Earth's lithosphere is made up of big pieces, called tectonic plates, that fit together like a puzzle. Sometimes these plates move away from each other, sometimes they slam into each other, and sometimes they slide past each other. These movements create things like earthquakes, mountains, and even islands.
Scientists who study tectonophysics use lots of cool tools, like GPS and seismometers, to figure out how the lithosphere is moving and changing. They also study geology, which is like the history of the Earth, to see how things have changed over millions of years. This helps us understand more about the Earth and how it works.