So imagine you are playing in a big pile of snow. You jump on top of it and make it flat, but then you notice there's a big bump sticking up. That bump is called a nunatak!
A nunatak is basically a big bump of rock or ice that sticks up through the snow and ice on top of a mountain or ice sheet. It's like a little island in a sea of ice and snow.
Nunataks are pretty cool because they can be really different from the rest of the landscape around them. They can have plants and animals living on them that can't survive on the icy snow that covers most of the area. They can also be important for scientists who study things like glaciers and climate change, because they can give information about what the area was like before the ice and snow covered everything up.
So now you know what a nunatak is and why it's important!